diff --git a/man5/proc.5 b/man5/proc.5
index c5eb56a4c..346ca630f 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -6179,6 +6179,7 @@ of thing that needs to be updated very often.
 .BR readlink (2),
 .BR syslog (2),
 .BR slabinfo (5),
+.BR sysfs (5),
 .BR hier (7),
 .BR namespaces (7),
 .BR time (7),