diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index d22dca2..f052574 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1323,7 +1323,7 @@
 PyDoc_STRVAR(len_doc,
 "len(object) -> integer\n\
 \n\
-Return the number of items of a sequence or mapping.");
+Return the number of items of a sequence or collection.");
 
 
 static PyObject *