Add info about the set API.
diff --git a/Doc/api/refcounts.dat b/Doc/api/refcounts.dat
index 0f2e9b5..5587bf1 100644
--- a/Doc/api/refcounts.dat
+++ b/Doc/api/refcounts.dat
@@ -1009,6 +1009,25 @@
PySequence_Tuple:PyObject*::+1:
PySequence_Tuple:PyObject*:o:0:
+PySet_Append:int:::
+PySet_Append:PyObject*:set:0:
+PySet_Append:PyObject*:key:+1:
+
+PySet_Contains:int:::
+PySet_Contains:PyObject*:anyset:0:
+PySet_Contains:PyObject*:key:0:
+
+PySet_Discard:int:::
+PySet_Discard:PyObject*:set:0:
+PySet_Discard:PyObject*:key:-1:no effect if key not found
+
+PySet_Pop:PyObject*::+1:or NULL if key not found
+PySet_Pop:PyObject*:set:0:
+PySet_Pop:PyObject*:key:-1:no effect if key not found
+
+PySet_Size:int:::
+PySet_Size:PyObject*:anyset:0:
+
PySlice_Check:int:::
PySlice_Check:PyObject*:ob:0: