diff --git a/Objects/setobject.c b/Objects/setobject.c
index 27b41a1..742dadc 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2090,7 +2090,8 @@
 };
 
 PyDoc_STRVAR(set_doc,
-"set(iterable) --> set object\n\
+"set() -> new empty set object\n\
+set(iterable) -> new set object\n\
 \n\
 Build an unordered collection of unique elements.");
 
@@ -2187,7 +2188,8 @@
 };
 
 PyDoc_STRVAR(frozenset_doc,
-"frozenset(iterable) --> frozenset object\n\
+"frozenset() -> empty frozenset object\n\
+frozenset(iterable) -> frozenset object\n\
 \n\
 Build an immutable unordered collection of unique elements.");