diff --git a/README.md b/README.md
index eca3b61c..b7e1614b 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ CAD program, and create G-Code for Isolation routing.
 10.09.2019
 
 - made isolation threaded
+- fixed a small typo in TclCommandCopperCLear
 
 9.09.2019
 
diff --git a/tclCommands/TclCommandCopperClear.py b/tclCommands/TclCommandCopperClear.py
index 74b5a9bf..552ab393 100644
--- a/tclCommands/TclCommandCopperClear.py
+++ b/tclCommands/TclCommandCopperClear.py
@@ -214,7 +214,7 @@ class TclCommandCopperClear(TclCommand):
         if 'all' in args and args['all'] == 1:
             self.app.ncclear_tool.clear_copper(ncc_obj=obj,
                                                select_method='itself',
-                                               tooldia=tooldia,
+                                               ncctooldia=tooldia,
                                                overlap=overlap,
                                                order=order,
                                                margin=margin,