diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 6d4da23a2b9..98178727263 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -46,6 +46,7 @@ Module interface:
 - socket.gethostbyname(hostname) --> host IP address (string: 'dd.dd.dd.dd')
 - socket.gethostbyaddr(IP address) --> (hostname, [alias, ...], [IP addr, ...])
 - socket.gethostname() --> host name (string: 'spam' or 'spam.domain.com')
+- socket.getprotobyname(protocolname) --> protocol number
 - socket.getservbyname(servicename, protocolname) --> port number
 - socket.socket(family, type [, proto]) --> new socket object
 - socket.ntohs(16 bit value) --> new int object