diff --git a/python/pyspark/pandas/base.py b/python/pyspark/pandas/base.py
index 350674e5e52da..c8aba566c5502 100644
--- a/python/pyspark/pandas/base.py
+++ b/python/pyspark/pandas/base.py
@@ -73,7 +73,7 @@ def align_diff_index_ops(
 
     Parameters
     ----------
-    func : The function to apply
+    func : The function to apply.
     this_index_ops : IndexOpsMixin
         A base `IndexOpsMixin` object
     args : list of other arguments including other `IndexOpsMixin` objects