diff --git a/include/net/sock.h b/include/net/sock.h
index bb972d2..97fc0ad 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -226,6 +226,7 @@
   *	@sk_ack_backlog: current listen backlog
   *	@sk_max_ack_backlog: listen backlog set in listen()
   *	@sk_priority: %SO_PRIORITY setting
+  *	@sk_cgrp_prioidx: socket group's priority map index
   *	@sk_type: socket type (%SOCK_STREAM, etc)
   *	@sk_protocol: which protocol this socket belongs in this network family
   *	@sk_peer_pid: &struct pid for this socket's peer