diff --git a/src/pydartdiags/obs_sequence/obs_sequence.py b/src/pydartdiags/obs_sequence/obs_sequence.py
index 7a5be45..654c9e1 100644
--- a/src/pydartdiags/obs_sequence/obs_sequence.py
+++ b/src/pydartdiags/obs_sequence/obs_sequence.py
@@ -60,7 +60,8 @@ class obs_sequence:
                         'AIRS observation', 
                         'GTSPP observation', 
                         'SST observation',
-                        'observations']
+                        'observations',
+                        'WOD observation']
     
     def __init__(self, file):
         self.loc_mod = 'None'