diff --git a/Doc/api/refcounts.dat b/Doc/api/refcounts.dat
index 7bba011d773..ab6d865b041 100644
--- a/Doc/api/refcounts.dat
+++ b/Doc/api/refcounts.dat
@@ -1147,7 +1147,7 @@ PySet_Discard:PyObject*:key:-1:no effect if key not found
 PySet_New:PyObject*::+1:
 PySet_New:PyObject*:iterable:0:
 
-PySet_Pop:PyObject*::0:or returns NULL and raises KeyError if set is empty
+PySet_Pop:PyObject*::+1:or returns NULL and raises KeyError if set is empty
 PySet_Pop:PyObject*:set:0:
 
 PySet_Size:int:::