patchgit-rebase -i: improve help readability

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 3f926d8..c1b4260 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -215,6 +215,15 @@ do_next () {
 		pick_one $sha1 ||
 			die_with_patch $sha1 "Could not apply $sha1... $rest"
 		;;
+	comment|c)
+		comment_for_reflog comment
+
+		mark_action_done
+		pick_one $sha1 ||
+			die_with_patch $sha1 "Could not apply $sha1... $rest"
+		output git commit --no-verify --amend -e -C HEAD
+		;;
+
 	edit|e)
 		comment_for_reflog edit
 
@@ -688,6 +697,7 @@ do
 # Commands:
 #  p, pick = use commit
 #  e, edit = use commit, but stop for amending
+#  c, comment = use commit, but stop for changing the commit message
 #  s, squash = use commit, but meld into previous commit
 #  mark :mark = mark the current HEAD for later reference
 #  reset commit = reset HEAD to the commit

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index c1b4260..a3c5488 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -695,15 +695,16 @@ do
 # to a commit previously marked with the 'mark' insn.
 #
 # Commands:
-#  p, pick = use commit
-#  e, edit = use commit, but stop for amending
-#  c, comment = use commit, but stop for changing the commit message
-#  s, squash = use commit, but meld into previous commit
-#  mark :mark = mark the current HEAD for later reference
-#  reset commit = reset HEAD to the commit
-#  merge commit-M commit-P ... = redo merge commit-M with the
-#         current HEAD and the parents commit-P
-#  tag = reset tag to the current HEAD
+#  p, pick         use commit
+#  e, edit         use commit, but stop for amending
+#  c, comment      use commit, but update the commit message on the way
+#  s, squash       use commit, but meld into previous commit
+#  mark :mark      mark the current HEAD for later reference
+#  reset commit    reset HEAD to the commit
+#  merge commit-M commit-P
+#                  redo merge commit-M with the current HEAD
+#                  and the parents commit-P
+#  tag             reset tag to the current HEAD
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.