accept_filter.9: Add missing include.

diff --git a/share/man/man9/accept_filter.9 b/share/man/man9/accept_filter.9
index 43c0f3c..458d1ba 100644 (file)
--- a/share/man/man9/accept_filter.9
+++ b/share/man/man9/accept_filter.9
@@ -40,6 +40,7 @@
 .In sys/module.h
 .In sys/socket.h
 .Fd #define ACCEPT_FILTER_MOD
+.In sys/sysctl.h
 .In sys/socketvar.h
 .Ft int
 .Fn accept_filt_add "struct accept_filter *filt"