diff --git a/pandas/core/indexes/multi.py b/pandas/core/indexes/multi.py
index 4cc59f5297058..a0f5472493344 100644
--- a/pandas/core/indexes/multi.py
+++ b/pandas/core/indexes/multi.py
@@ -809,9 +809,10 @@ def duplicated(self, keep='first'):
 
         return duplicated_int64(ids, keep)
 
-    @Appender(ibase._index_shared_docs['fillna'])
     def fillna(self, value=None, downcast=None):
-        # isna is not implemented for MultiIndex
+        """
+        fillna is not implemented for MultiIndex
+        """
         raise NotImplementedError('isna is not defined for MultiIndex')
 
     @Appender(_index_shared_docs['dropna'])