Tender notices and bidding documents are sometimes changed after they are first issued. A procuring agency may need to correct an error, clarify a requirement, extend a deadline, revise a specification, or provide additional information to bidders. These changes are commonly communicated through a corrigendum, addendum, amendment, or another formal update.
For bidders, these updates can be extremely important. A bid prepared only from the original advertisement may become incomplete or incorrect if the procuring agency later changes the submission date, specifications, bid security requirement, eligibility conditions, quantities, or another material part of the procurement.
This guide explains the basic meaning of corrigenda and addenda and why bidders should always check the latest official tender information before submitting a bid.
What Is a Corrigendum in a Tender?
A corrigendum generally refers to an official correction issued after a tender notice or bidding document has already been published.
It may be used when the procuring agency needs to correct information such as:
- Submission date
- Bid opening date or time
- Tender reference number
- Eligibility requirement
- Bid security amount
- Quantity
- Specification
- Office address
- Contact information
- Another error appearing in the original procurement documents
The exact effect of a corrigendum depends on what the procuring agency has officially changed.
What Is an Addendum in a Tender?
An addendum generally provides additional or revised information relating to procurement documents that have already been issued.
Instead of merely correcting a typographical error, an addendum may add, expand, clarify, replace, or revise part of the tender requirements.
Depending on the procurement, an addendum may deal with:
- Additional technical specifications
- Revised drawings
- Updated Bills of Quantities
- Additional qualification requirements
- Changes to forms or schedules
- Clarifications to Terms of Reference
- Revised submission instructions
- Updated contractual conditions
- Responses affecting the bidding documents
The terminology used by procuring agencies can vary, so bidders should focus on the actual content and effect of the official update rather than relying only on whether it is titled “Corrigendum” or “Addendum.”
Corrigendum vs Addendum – Simple Difference
| Term | Simple Meaning | Example |
|---|---|---|
| Corrigendum | Usually corrects or revises information already published. | Submission date printed incorrectly and later corrected. |
| Addendum | Usually adds, expands, or formally modifies information in the procurement documents. | Additional specification or revised BOQ issued after the original bidding documents. |
This is a simplified distinction. Procuring agencies may use the terms differently, and some may use broader wording such as amendment for either type of change.
Why Do Procuring Agencies Issue Corrigenda?
Tender documents can contain errors or circumstances can change after publication.
A corrigendum may therefore be issued because:
- A date was printed incorrectly.
- The bid opening time changed.
- The bid security amount needs correction.
- A specification contained an error.
- The tender reference was incorrect.
- A requirement needs clarification.
- The procuring agency extends the submission deadline.
- Another published detail requires formal correction.
Bidders should treat an official correction as part of the tender documents rather than continuing to rely on the earlier incorrect information.
Why Do Procuring Agencies Issue Addenda?
An addendum may be needed when additional information becomes necessary after bidders have already received or accessed the original documents.
For example, the procuring agency may need to:
- Add technical details
- Issue revised drawings
- Modify quantities
- Clarify the scope of work
- Add a missing form
- Change a contractual condition
- Provide additional instructions
The addendum may become an important part of the procurement package, so bidders should review it together with the original bidding documents.
Example 1: Tender Submission Date Is Extended
Suppose an original tender notice states:
Bid Submission Deadline: 10 September at 11:00 AM
Later, the procuring agency issues a corrigendum stating:
Revised Bid Submission Deadline: 17 September at 11:00 AM
Bidders should then follow the formally revised deadline rather than the date printed in the original notice.
They should also check whether the extension affects other requirements such as:
- Bid validity
- Bid security validity
- Opening date
- Document validity
- Other time-sensitive requirements
Example 2: Bid Security Amount Is Corrected
Suppose the original tender notice states one bid-security amount, but the procuring agency later identifies an error and issues an official correction.
A bidder who prepares security using only the original notice could submit the wrong amount.
Before arranging the security instrument, check:
- Latest required amount
- Acceptable form
- Beneficiary
- Validity
- Tender reference
- Any amendment affecting the requirement
This is one reason bid security should not be arranged solely from an old saved advertisement without checking for updates.
Example 3: Revised Technical Specification
Suppose a tender originally requires a particular technical specification for equipment.
After receiving bidder questions or reviewing the documents, the procuring agency issues an addendum revising part of that specification.
The bidder should prepare the technical offer according to the revised requirement.
Submitting equipment only against the superseded specification may create a compliance problem even if the bidder correctly followed the original document when it was first downloaded.
Example 4: Revised Bill of Quantities
For works procurements, an addendum may sometimes issue a revised Bill of Quantities (BOQ) or schedule.
Changes could potentially involve:
- Item descriptions
- Quantities
- Units
- Additional items
- Deleted items
- Another correction to the pricing schedule
If a revised BOQ is officially issued, bidders should check whether it replaces the earlier version and prepare pricing according to the latest instructions.
Example 5: Additional Qualification Requirement
An addendum may clarify or revise eligibility or qualification requirements.
For example, it could provide more detail regarding:
- Relevant experience
- Required registration where applicable
- Financial capacity
- Technical personnel
- Manufacturer authorization
- Other procurement-specific qualifications
Bidders should compare any revised requirement with the documents they planned to submit.
Where Are Corrigenda and Addenda Published?
The publication method depends on the procuring agency and procurement system.
Updates may appear through:
- Procuring agency website
- Procurement authority portal
- Electronic procurement system
- Tender notice page
- Newspaper where applicable
- Direct communication to registered bidders
- Another official channel identified in the bidding documents
Bidders should identify the official source used for that procurement and check it regularly until the submission deadline.
Do Not Depend Only on the Newspaper Advertisement
A newspaper notice may provide the initial tender information, but detailed documents and later updates may be available through another official source.
Before submitting a bid, check:
- The original advertisement
- Detailed bidding documents
- Official tender webpage
- Any electronic procurement listing
- Corrigenda
- Addenda
- Clarifications or amendments formally issued by the procuring agency
A printed copy of the original notice can become outdated once an official amendment is issued.
Check for Updates More Than Once
Do not check for a corrigendum only when you first download the bidding documents.
A better approach is to check:
- When you first find the procurement.
- When you download the bidding documents.
- Before arranging bid security.
- Before finalizing technical and financial submissions.
- Again shortly before submission.
This helps reduce the risk of missing an update issued during the bidding period.
How to Review a Corrigendum Properly
When a corrigendum is issued, do not read only the headline.
Compare it directly with the original document and identify:
- What information has changed
- Which original clause or section is affected
- Whether the old information is replaced
- Whether another deadline changes as a result
- Whether your prepared documents need revision
Highlight or record the corrected information in your tender checklist.
How to Review an Addendum Properly
An addendum can sometimes be longer and more detailed than a simple correction.
Check whether it includes:
- Replacement pages
- Additional schedules
- Revised forms
- New technical requirements
- Updated Terms of Reference
- Revised quantities
- Clarification of earlier clauses
Where a revised page replaces an earlier page, make sure your working tender file clearly identifies which version is current.
Maintain a Tender Amendment Register
For larger tenders, bidders can maintain a simple amendment register.
| Update | Date | Main Change | Action Required |
|---|---|---|---|
| Corrigendum No. 1 | ________ | ________ | ________ |
| Addendum No. 1 | ________ | ________ | ________ |
| Corrigendum No. 2 | ________ | ________ | ________ |
This is particularly useful when several amendments are issued during a long procurement process.
Do Corrigenda Become Part of the Tender Documents?
Where an official corrigendum or amendment modifies the bidding documents, bidders should generally treat the updated requirement as part of the procurement package according to the instructions governing that tender.
Do not deliberately ignore a formal amendment simply because the original version is easier to satisfy.
The procuring agency's latest officially issued documents should guide preparation of the bid.
Do Addenda Become Part of the Tender Documents?
An officially issued addendum may modify or supplement the original tender documents.
Bidders should therefore keep:
- Original bidding documents
- Every corrigendum
- Every addendum
- Replacement pages
- Official clarifications where applicable
Organize them together so the team preparing the bid works from the complete and current procurement package.
What If the Corrigendum Extends the Deadline?
A deadline extension can provide bidders additional preparation time, but it may also affect other tender documents.
Recheck:
- Bid validity
- Bid security validity
- Authorization dates where relevant
- Certificates with expiry dates
- Financial instruments
- Submission envelope or portal information
Do not assume that only the deadline needs attention.
What If a Corrigendum Reduces or Changes the Time Available?
Any revised procurement timeline should be checked carefully.
Once an official update is issued, bidders should immediately revise their internal tender schedule and confirm the final submission date and time through the official source.
Do not rely on a calendar reminder created from the original notice after the procurement timeline has been amended.
What If the Specification Changes?
When specifications change, review every part of the bid that depends on those specifications.
This can include:
- Technical compliance statement
- Manufacturer documentation
- Model offered
- Quantity
- Pricing
- Delivery schedule
- Supporting certificates
A change in one technical requirement can affect several parts of the submission.
What If the BOQ Changes?
If a revised Bill of Quantities or price schedule is issued, bidders should confirm which version must be priced and submitted.
Do not simply copy prices from the earlier BOQ into the revised document without checking:
- New items
- Deleted items
- Changed quantities
- Changed descriptions
- Changed units
- Other revisions
A revised BOQ deserves a fresh review before the financial bid is finalized.
Clarification vs Corrigendum
A clarification and corrigendum can also be different.
| Term | General Purpose |
|---|---|
| Clarification | Explains or answers a question about existing procurement requirements. |
| Corrigendum | Formally corrects or revises information previously issued. |
| Addendum / Amendment | Adds to or modifies the procurement documents. |
The exact terminology and legal effect should be determined from the particular procurement documents and applicable procurement framework.
Pre-Bid Meeting Clarifications
Some procurements include a pre-bid meeting or formal clarification process.
Questions from bidders may lead the procuring agency to:
- Explain an existing requirement
- Correct a document
- Issue revised specifications
- Provide an addendum
- Extend the deadline
A verbal statement made during a meeting should not automatically be treated as a formal change unless it is communicated through the official process applicable to the procurement.
Do Not Rely Only on Verbal Information
A bidder may hear that the tender date has changed or a requirement has been removed.
Do not revise an important bid requirement only because:
- Another contractor says so.
- A WhatsApp group shares an update.
- An unofficial person claims to know about the change.
- An employee provides an informal verbal comment.
Check whether the change has been formally communicated through the authorized procurement channel.
Keep Copies of Every Update
Download or save every official corrigendum, addendum, and amendment connected with the procurement.
Use clear file names such as:
- Tender-Original.pdf
- Corrigendum-01.pdf
- Addendum-01.pdf
- Revised-BOQ.pdf
- Corrigendum-02.pdf
- Final-Submission-Instructions.pdf
This prevents team members from accidentally working with superseded documents.
Mark Superseded Documents Clearly
When a revised form or schedule replaces an earlier version, mark the old working copy clearly so it is not submitted accidentally.
For example:
SUPERSEDED – DO NOT USE
can be added to your internal copy or file name while keeping the original document for your records.
Update Your Tender Compliance Checklist
Every formal amendment should trigger a review of your compliance checklist.
Recheck:
- Eligibility documents
- Technical specifications
- Financial forms
- Bid security
- Bid validity
- Submission date
- Opening date
- Required signatures
- Required forms
- Packaging or electronic submission instructions
This helps ensure that the final submission reflects the latest requirements rather than the original version alone.
Common Corrigendum and Addendum Mistakes
| Mistake | Better Approach |
|---|---|
| Preparing the bid only from the original advertisement | Check the latest official procurement documents before submission. |
| Missing an extended deadline | Update your internal tender calendar whenever an amendment is issued. |
| Using an old BOQ | Confirm whether a revised BOQ or price schedule has replaced it. |
| Ignoring changes to bid security | Recheck amount, validity, beneficiary and form after amendments. |
| Relying on WhatsApp information | Confirm important changes through the official procurement source. |
| Mixing old and revised pages | Keep a controlled set of the latest documents for bid preparation. |
| Checking for updates only once | Check again shortly before final submission. |
Corrigendum & Addendum Checklist
- Check whether any corrigendum has been issued.
- Check whether any addendum or amendment has been issued.
- Compare every update with the original documents.
- Record which clauses or pages have changed.
- Replace superseded forms and schedules.
- Check whether the deadline has changed.
- Check whether the opening date has changed.
- Recheck bid security amount and validity.
- Recheck technical specifications.
- Recheck BOQ or price schedules.
- Recheck qualification requirements.
- Update the tender compliance checklist.
- Keep copies of all official amendments.
- Check the official source again before final submission.
Frequently Asked Questions
What is a corrigendum in a tender?
A corrigendum generally refers to an official correction or revision issued after the original tender notice or bidding documents have been published.
What is an addendum in a tender?
An addendum generally adds, supplements, clarifies, or formally modifies information contained in the original procurement documents.
What is the difference between corrigendum and addendum?
A corrigendum commonly corrects existing information, while an addendum commonly adds or modifies information. However, procuring agencies may use different terminology, so bidders should focus on the actual changes stated in the document.
Can a corrigendum change the tender deadline?
Yes, a procuring agency may formally revise submission or opening dates. Bidders should use the latest officially issued dates.
Can an addendum change technical specifications?
It may, depending on the procurement. Bidders should compare every addendum with the original technical requirements and revise their bid where necessary.
Can bid security requirements change through a corrigendum?
A procuring agency may issue an official amendment affecting the amount, validity, submission date, or another security-related requirement. Always check the latest documents before arranging the instrument.
What if I already prepared my bid before the corrigendum?
Review the complete bid against the amendment and revise every affected section before submission.
Should I use the original BOQ or revised BOQ?
Follow the latest official instructions. Where an addendum replaces the original BOQ with a revised version, bidders should generally use the version specified as current.
Should I check for corrigenda even after downloading the documents?
Yes. An amendment can be issued later during the bidding period, so bidders should continue checking the official procurement source until submission.
Is a WhatsApp message enough proof that the tender date changed?
No. Important changes should be confirmed through an official procurement notice, portal, amendment, or other authorized communication applicable to the tender.
Is a clarification the same as a corrigendum?
Not necessarily. A clarification may explain an existing requirement, while a corrigendum formally corrects or revises information. The procurement documents determine the effect of each communication.
Should I keep copies of old tender documents after an amendment?
Yes, keeping previous versions can be useful for your records, but clearly identify which documents have been superseded so they are not accidentally used in the final bid.
What is the safest way to avoid missing tender amendments?
Monitor the official procurement source regularly, maintain an amendment register, update your tender checklist whenever a change is issued, and perform one final update check before submission.
Final Advice
A corrigendum or addendum may look like a small update, but it can change an important part of a tender. A revised deadline, specification, BOQ, bid security requirement, eligibility condition, or submission instruction can directly affect how the bid should be prepared.
Do not treat the original tender advertisement as permanently final. Keep monitoring the official procurement source, save every formal update, and compare amendments carefully with the documents you already downloaded.
Before submitting the bid, perform a final review of the deadline, bid security, specifications, quantities, eligibility requirements, forms, financial schedules, and submission instructions against the latest available procurement documents.
The safest tender file is not simply the one containing the original bidding documents—it is the one containing the complete and current set of documents, including all officially issued corrections and amendments.
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