#6175: document that inet_aton supports alternate input formats with less than three dots.
diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index d1b107e..97fe268 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -401,6 +401,9 @@
library and needs objects of type :ctype:`struct in_addr`, which is the C type
for the 32-bit packed binary this function returns.
+ :func:`inet_aton` also accepts strings with less than three dots; see the
+ Unix manual page :manpage:`inet(3)` for details.
+
If the IPv4 address string passed to this function is invalid,
:exc:`socket.error` will be raised. Note that exactly what is valid depends on
the underlying C implementation of :cfunc:`inet_aton`.