diff --git a/lib/libc/sys/socket.2 b/lib/libc/sys/socket.2
index f86d6930796..7fbe97616c8 100644
--- a/lib/libc/sys/socket.2
+++ b/lib/libc/sys/socket.2
@@ -281,6 +281,7 @@ The socket cannot be created until sufficient resources are freed.
 .Xr socketpair 2 ,
 .Xr write 2 ,
 .Xr getprotoent 3 ,
+.Xr netgraph 4 ,
 .Xr protocols 5
 .Rs
 .%T "An Introductory 4.3 BSD Interprocess Communication Tutorial"