`git commit --amend` covered, but not `datalad save --amend`

[mih]

n.t.

[adswa]

indeed - I checked how git commit --amend is used in handbook examples, and its always to fix up a commit message. The use cases "oh no I forgot to add a modification to my commit" should be included, though, too, and mention datalad save --amend

[adswa]

added it in the back and forth in time chapter