Hadith writing requires legible script, accurate transcription, vowels for difficult words, consonantal dots for ambiguous letters, and preservation of the received text. If an omission is discovered, its addition should clearly indicate the point at which it belongs.
Mark difficult expressions and dot ambiguous letters.
Missing text can be placed in a suitable margin with an insertion indicator. The right margin may be preferred when available, with another margin used if necessary.
A wrong dot in a transmitter's name or a silent change in the matn can change attribution. Corrections should therefore remain distinguishable and verifiable.