diff --git a/man2/fsync.2 b/man2/fsync.2
index 896fcaede..5300f4dbf 100644
--- a/man2/fsync.2
+++ b/man2/fsync.2
@@ -168,5 +168,6 @@ to guarantee safe operation.
 .BR pwritev (2),
 .BR sync (2),
 .BR sync_file_range (2),
+.BR fileno (3),
 .BR hdparm (8),
 .BR mount (8)