diff --git a/python/pyspark/sql/types.py b/python/pyspark/sql/types.py
index 4a023123b6ecaf6b93b66d41a0626cf376b63156..26b54a7fb370965312c66e4a477319f798364a0e 100644
--- a/python/pyspark/sql/types.py
+++ b/python/pyspark/sql/types.py
@@ -1389,7 +1389,9 @@ class Row(tuple):
     ``key in row`` will search through row keys.
 
     Row can be used to create a row object by using named arguments,
-    the fields will be sorted by names.
+    the fields will be sorted by names. It is not allowed to omit
+    a named argument to represent the value is None or missing. This should be
+    explicitly set to None in this case.
 
     >>> row = Row(name="Alice", age=11)
     >>> row