Occasionally I commit some code to the repository, add a comment/summary, then read the summary back and realise I\'ve made a mistake or should have included a bit more info
hg 2.2 just added the git-like --amend option. (See the hg 2.2 release notes.)
git
--amend
So you can do this on the command line:
hg commit --amend
See also Mercurial: how to amend the last commit?
I have not figured out how to do this in TortoiseHg.