diff --git a/fusionbox/forms/fields.py b/fusionbox/forms/fields.py
index d93d5b8..3e08283 100644
--- a/fusionbox/forms/fields.py
+++ b/fusionbox/forms/fields.py
@@ -204,7 +204,7 @@ def __init__(self, month, year):
             self.year = year
 
     def __init__(self, *args, **kwargs):
-        kwargs.setdefault('help_text', "MM / YY")
+        kwargs.setdefault('help_text', "MM / YY or MM / YYYY")
         super(CCExpirationDateField, self).__init__(*args, **kwargs)
 
     def clean(self, value):