User blog comment:DaNASCAT/Technical Update: November 21, 2016/@comment-24473195-20161122152730/@comment-24473195-20161122172737

> I've seen people, including myself, leave summaries on page creation. These can definitely help future editors and shouldn't ever be eliminated.

It may be possible, if one types quickly before the page autosaves, although that may lead to incomplete summaries.