diff --git a/doc/todo/git-annex-reinject_--known_should_not_fail_when_the_file_extension_is_different/comment_2_3df0601d0d999bdcbeb0f462e01f8863._comment b/doc/todo/git-annex-reinject_--known_should_not_fail_when_the_file_extension_is_different/comment_2_3df0601d0d999bdcbeb0f462e01f8863._comment
new file mode 100644
index 0000000000..fb54f48029
--- /dev/null
+++ b/doc/todo/git-annex-reinject_--known_should_not_fail_when_the_file_extension_is_different/comment_2_3df0601d0d999bdcbeb0f462e01f8863._comment
@@ -0,0 +1,10 @@
+[[!comment format=mdwn
+ username="spwhitton"
+ avatar="http://cdn.libravatar.org/avatar/9c3f08f80e67733fd506c353239569eb"
+ subject="comment 2"
+ date="2020-01-07T12:29:47Z"
+ content="""
+Thank you for your reply.  Makes sense.  If that's the only way to do it then it might as well be a helper script rather than part of git-annex.
+
+Leaving this bug open because it would be good to have the limitation documented in git-annex-reinject(1).
+"""]]