I have updated a version of a page and forgot to fill "What was changed". Can i fill it later on?

[amiram.fuerst]

When i update a page, it asks- "What was changed". If i fill it, the answer is located as Comment in the version history.

What happens if i forgot to answer what was changed, and i want to update the comment after the update was done?

Note- in the past, i could edit properties and change this field.