diff --git a/tljh/config.py b/tljh/config.py
index 3f942c8..6dc2ed2 100644
--- a/tljh/config.py
+++ b/tljh/config.py
@@ -223,7 +223,7 @@ def unset_config_value(config_path, key_path, validate):
         yaml.dump(config, f)
 
 
-def add_config_value(config_path, key_path, value, validate):
+def add_config_value(config_path, key_path, value, validate=True):
     """
     Add value to list at key_path
     """