Minor patch (--purge instead of --purge-output)
diff --git a/lib/parse/cmdline.py b/lib/parse/cmdline.py
index 062f52c6f3a..ab2fbe8ebb8 100644
--- a/lib/parse/cmdline.py
+++ b/lib/parse/cmdline.py
@@ -875,7 +875,7 @@ def _(self, *args):
             args.url = args.url or DUMMY_URL
 
         if not any((args.direct, args.url, args.logFile, args.bulkFile, args.googleDork, args.configFile, args.requestFile, args.updateAll, args.smokeTest, args.liveTest, args.wizard, args.dependencies, args.purge, args.sitemapUrl)):
-            errMsg = "missing a mandatory option (-d, -u, -l, -m, -r, -g, -c, -x, --wizard, --update, --purge-output or --dependencies), "
+            errMsg = "missing a mandatory option (-d, -u, -l, -m, -r, -g, -c, -x, --wizard, --update, --purge or --dependencies), "
             errMsg += "use -h for basic or -hh for advanced help\n"
             parser.error(errMsg)
 
