diff --git a/pylot/core/io/default_parameters.py b/pylot/core/io/default_parameters.py
index 4a6e75b7..f6176788 100644
--- a/pylot/core/io/default_parameters.py
+++ b/pylot/core/io/default_parameters.py
@@ -391,7 +391,7 @@ defaults = {'rootpath': {'type': str,
                          'namestring': 'Use TauPy'},
 
             'taup_model': {'type': str,
-                           'tooltip': 'define TauPy model for traveltime estimation',
+                           'tooltip': 'define TauPy model for traveltime estimation. Possible values: 1066a, 1066b, ak135, ak135f, herrin, iasp91, jb, prem, pwdk, sp6',
                            'value': 'iasp91',
                            'namestring': 'TauPy model'}
             }