@@ -2,7 +2,7 @@
 #
 # Auto-prefix commit messages based on branch name:
 #   fix/<number>..., feature/<number>..., release/<number>..., chore/<number>...
-#     -> "refs #<number> <message>"
+#     -> "refs #<number>: <message>"
 #
 
 set -eu
@@ -38,11 +38,11 @@ case "$FIRST_LINE" in
     ;;
 esac
 
-PREFIX="refs #${TASK_NUMBER} "
+PREFIX="refs #${TASK_NUMBER}: "
 
 # Already has the right prefix (or already references the number at start) -> no-op.
 case "$FIRST_LINE" in
-  "$PREFIX"*|"refs #${TASK_NUMBER} "*)
+  "$PREFIX"*|"refs #${TASK_NUMBER} "*|"refs #${TASK_NUMBER}:"*)
     exit 0
     ;;
 esac