diff --git a/tclCommands/TclCommandListSys.py b/tclCommands/TclCommandListSys.py
index 179be874..87d5a761 100644
--- a/tclCommands/TclCommandListSys.py
+++ b/tclCommands/TclCommandListSys.py
@@ -28,17 +28,18 @@ class TclCommandListSys(TclCommand):
     # structured help for current command, args needs to be ordered
     help = {
         'main': "Returns the list of the names of system variables.\n"
-                "Without a parameter it will list all the system parameters. "
-                "As a parameter use first letter or first letters from the name "
+                "Without an argument it will list all the system parameters. "
+                "As an argument use first letter or first letters from the name "
                 "of the system variable.\n"
                 "In that case it will list only the system variables that starts with that string.\n"
                 "Main categories start with: gerber or excellon or geometry or cncjob or global.\n"
-                "Note: Use get_sys command to get the value and set_sys command to set it.\n",
+                "Note: Use get_sys TclCommand to get the value and set_sys TclCommand to set it.\n",
         'args': collections.OrderedDict([
         ]),
         'examples': ['list_sys',
+                     'list_sys ser'
                      'list_sys gerber',
-                     'list_sys cncjob']
+                     'list_sys cncj']
     }
 
     def execute(self, args, unnamed_args):
@@ -50,7 +51,6 @@ class TclCommandListSys(TclCommand):
         """
         if 'selection' in args:
             argument = args['selection']
-            print(argument)
             return str([k for k in self.app.defaults.keys() if str(k).startswith(str(argument))])
         else:
             return str([*self.app.defaults])
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