diff --git a/pandas/_typing.py b/pandas/_typing.py
index 889252bb00438..530fb6f60c1d0 100644
--- a/pandas/_typing.py
+++ b/pandas/_typing.py
@@ -219,6 +219,8 @@ def __reversed__(self) -> Iterator[_T_co]: ...
 )
 
 # For functions like rename that convert one label to another
+# For example, you can pass a dict like {'old_name' : 'new_name'}
+# or a function like str.lower
 Renamer: TypeAlias = Mapping[Any, Hashable] | Callable[[Any], Hashable]
 
 # to maintain type information across generic functions and parametrization