Short answer. Your petition must be a sworn affidavit supported by: a certified true copy of the certificate or registry page carrying the wrong entry; at least two public or private documents showing the correct entry; and any other documents the registrar finds relevant. A law-enforcement clearance and newspaper publication are also required in certain cases.
What the law says
The petition shall be supported with the following documents: (1) A certified true machine copy of the certificate or of the page of the registry book containing the entry or entries sought to be corrected or changed. (2) At least two (2) public or private documents showing the correct entry or entries upon which the correction or change shall be based
RA 9048, Section 5 — Form Contents And Publication. Read the full provision →
The petition is a sworn affidavit
Under Republic Act No. 9048, a correction is not a casual request across the counter. The law requires that The petition shall be in the form of an affidavit, subscribed and sworn to before any person authorized by the law to administer oaths. The affidavit must set out the facts that establish the merits of the request, show that you are competent to testify to them, and state the particular erroneous entry you want corrected and the exact change you seek. Vagueness defeats it: you cannot simply ask for the record to be fixed in general.
The core supporting documents
The heart of the requirement is documentary proof. The petition must be supported with a certified true machine copy of the certificate or of the page of the registry book containing the entry or entries sought to be corrected, plus at least two (2) public or private documents showing the correct entry or entries upon which the correction or change shall be based. Those two documents are what actually justify the change — they must independently point to the correct fact, such as a baptismal record, school records, an identification document, or similar papers that predate the dispute.
Publication, clearance, and copies
For a change of first name or nickname, the law adds two safeguards beyond the documents. The petition must be published at least once a week for two (2) consecutive weeks in a newspaper of general circulation, so anyone with an objection can come forward. The petitioner must also submit a certification from the appropriate law enforcement agencies that he has no pending case or no criminal record, which guards against someone changing a name to escape a record.
What strong documents look like — and the limits
The quality of your two documents usually decides the outcome, so gather records made before the error became an issue that consistently show the correct entry; documents that conflict with each other invite denial. Keep in mind what this list does not do. It governs an administrative correction of a clerical error or a change of first name; it does not cover substantial changes — nationality, filiation, the year of birth — which must go to court instead, with different requirements. The registrar can also ask for more than the minimum, and a petition that is short on proof can be denied or held.
A later law expanded this process
This administrative correction process comes from Republic Act No. 9048. In 2012, Republic Act No. 10172 amended Republic Act No. 9048 to add two more errors — a wrong day or month of birth, and a wrong entry of sex — to this same civil-registrar route, without a court order. The procedure and documents above still apply; Republic Act No. 10172 widened what can be fixed, not how it works.