diff --git a/python/cudf/cudf/core/indexed_frame.py b/python/cudf/cudf/core/indexed_frame.py
index 7b0253de3bf..f36bec1b94e 100644
--- a/python/cudf/cudf/core/indexed_frame.py
+++ b/python/cudf/cudf/core/indexed_frame.py
@@ -359,6 +359,9 @@ def _from_columns_like_self(
         )
 
     def __round__(self, digits=0):
+        # Shouldn't be added to BinaryOperand
+        # because pandas Index doesn't implement
+        # this method.
         return self.round(decimals=digits)
 
     def _mimic_inplace(