diff --git a/src/cli/command_parser.rb b/src/cli/command_parser.rb
index 166566c3ac..357d1082ab 100755
--- a/src/cli/command_parser.rb
+++ b/src/cli/command_parser.rb
@@ -232,7 +232,7 @@ EOT
 
                 args_str=value[:args_format].collect{ |a|
                     if a.include?(nil)
-                        "[#{a.compact.join("|")}]"
+                        "[<#{a.compact.join("|")}>]"
                     else
                         "<#{a.join("|")}>"
                     end