Legal analysis: if important contents are omitted and need to be supplemented, the doctor should make supplementary explanations in time after discovering them, and the position is adjacent to the last relevant course record, indicating the supplementary explanation and signing time, or signing with the superior doctor at the same time. Modifying medical records is a legal act, while altering medical records is strictly prohibited by law.

Legal basis: Article 7 of the Basic Specification for Medical Record Writing states that when there are typos in the medical record writing process, they should be marked with double lines, and the original records should be kept clear and readable, with the date of revision indicated and signed by the reviser. Scraping, gluing, painting and other methods shall not be used to cover up or remove the original handwriting. The superior medical staff has the responsibility to review and modify the medical records written by the lower medical staff.