git shortlog --committer=name is documented, alas not implemented

`man git shortlog` (from git 2.45.0) has the following:

   --author=<pattern>, --committer=<pattern>
       Limit the commits output to ones with author/committer header lines 
       that match the specified pattern (regular expression). With more 
       than one --author=<pattern>, commits whose author matches any of 
       the given patterns are chosen (similarly for multiple 
       --committer=<pattern>).

Now `git shortlog --author=gerald` works as expected.

However `git shortlog --committer=gerald` results in an error:

  error: option `committer' takes no value

This is either a doc bug or an implementation issue?

Also, how does one list all commits by a certain committer (as opposed to author) then?

Thanks, Gerald