diff --git a/doc/scripts/xmllint.sh b/doc/scripts/xmllint.sh
index ed94cb7..c0f7cba 100755
--- a/doc/scripts/xmllint.sh
+++ b/doc/scripts/xmllint.sh
@@ -48,7 +48,7 @@ _debug()
 #usage
 _usage()
 {
-	echo "Usage: xmllint.sh target" 1>&2
+	echo "Usage: xmllint.sh [-c] target" 1>&2
 	return 1
 }