diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 05fd11c..722b427 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -5987,8 +5987,8 @@
 \n\
 Return a list of the words in S, using sep as the\n\
 delimiter string.  If maxsplit is given, at most maxsplit\n\
-splits are done. If sep is not specified, any whitespace string\n\
-is a separator.");
+splits are done. If sep is not specified or None,
+any whitespace string is a separator.");
 
 static PyObject*
 unicode_split(PyUnicodeObject *self, PyObject *args)