git reflog delete HEAD@{1} HEAD@{2} caught me by surprise...

Try the following commands in an empty directory: (I'm using the bash extention for {1..5}.)

git init
for i in {1..5}; do git commit -m "Commit $i" --allow-empty; done
git reflog
	bc93e06 HEAD@{0}: commit: Commit 5
	e14f92d HEAD@{1}: commit: Commit 4
	ac64d8e HEAD@{2}: commit: Commit 3
	287602b HEAD@{3}: commit: Commit 2
	183a378 HEAD@{4}: commit (initial): Commit 1
git reflog delete HEAD@{{1,2}}
git reflog
	bc93e06 HEAD@{0}: commit: Commit 5
	e14f92d HEAD@{1}: commit: Commit 3
	287602b HEAD@{2}: commit (initial): Commit 1

Er...I meant to delete Commit 3 from the reflog, not Commit 2.

In hindsight, it's obvious how this could happen, but it definitely took me by surprise when I was trying to delete the reference to a large and messy merge (that I didn't want and bloated my repository size) from the reflog.

If this is, in fact, Working As Designed, could I request a paragraph in the man page clarifying it? something like:

To delete single entries from the reflog, use the subcommand "delete" and specify the _exact_ entry (e.g. "`git reflog delete master@{2}`").

You may delete multiple reflog entries with one delete command, _however_ they are processed one at a time, so earlier deletes will cause renumbering that will affect later ones. To delete reflog entries @{2} and @{3}, the command would be either "`git reflog delete @{3} @{2}`", or "`git reflog delete @{2} @{2}`".