diff --git a/force_bdss/mco/base_mco_model.py b/force_bdss/mco/base_mco_model.py
index 8f3a56f0ff7b0d41ae9498a6dd64b25921f98626..d2d4e39c6fc7084a77a18e0978f81b8ad3e71b0b 100644
--- a/force_bdss/mco/base_mco_model.py
+++ b/force_bdss/mco/base_mco_model.py
@@ -18,6 +18,7 @@ class BaseMCOModel(ABCHasStrictTraits):
                       visible=False,
                       transient=True)
 
+    # A list of the parameters for the MCO
     parameters = List(BaseMCOParameter)
 
     def __init__(self, bundle, *args, **kwargs):