diff --git a/tt_tool.py b/tt_tool.py
index 66977c7..9a101f7 100755
--- a/tt_tool.py
+++ b/tt_tool.py
@@ -27,6 +27,7 @@ if __name__ == '__main__':
 
     # configure
     parser.add_argument('--create-user-config', help="create the user_config.tcl file with top module and source files", action="store_const", const=True)
+    parser.add_argument('--harden', help="use a local OpenLane install to harden the project", action="store_const", const=True)
 
     args = parser.parse_args()
 
@@ -64,6 +65,9 @@ if __name__ == '__main__':
     if args.create_user_config:
         project.create_user_config(project_yaml)
 
+    if args.harden:
+        project.harden()
+
     if args.create_pdf:
         documentation.create_pdf(project_yaml)