This question already has an answer here:
I attempt to write my edit summaries with the utmost care, but on occasion, I'll be moving to fix something else, and I'll end up with a messed up summary. I have found that if I re-edit within a certain time frame, I can change the summary.
However, I'm wondering if there is a way that I'm not aware of to edit the editing summary without having to make any additional changes.
If there is, or if this feature could be added, the readers of millions of future "fixed spe" messages would thank you.
I did search a bit on this, but searching "editing of edits of edit summaries" confounded the works.