--- a/tests/test-extdiff.t	Wed Sep 09 20:48:09 2015 -0400
+++ b/tests/test-extdiff.t	Wed Sep 09 21:07:38 2015 -0400
@@ -46,6 +46,7 @@
    -o --option OPT [+]      pass option to comparison program
    -r --rev REV [+]         revision
    -c --change REV          change made by revision
+      --patch               compare patches for two revisions
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories