diff --git a/pandas/io/formats/style.py b/pandas/io/formats/style.py
index 7ab2b9dec20c8..3358ec07eb819 100644
--- a/pandas/io/formats/style.py
+++ b/pandas/io/formats/style.py
@@ -1448,7 +1448,7 @@ def set_sticky(
 
         Parameters
         ----------
-        axis : {0 or 'index', 1 or 'columns', None}, default 0
+        axis : {0 or 'index', 1 or 'columns'}, default 0
             Whether to make the index or column headers sticky.
         pixel_size : int, optional
             Required to configure the width of index cells or the height of column