diff --git a/GPy/core/parameterization/ties_and_remappings.py b/GPy/core/parameterization/ties_and_remappings.py
index b06b4a2e..c72e8456 100644
--- a/GPy/core/parameterization/ties_and_remappings.py
+++ b/GPy/core/parameterization/ties_and_remappings.py
@@ -53,7 +53,9 @@ class Tie(Parameterized):
     ================================
     
     TODO:
-    * EVERYTHING
+    1. Properly handling parameters with constraints
+    2. Properly handling the merging of two models
+    3. Properly handling initialization
     
     """
     def __init__(self, name='tie'):