diff --git a/man2/clone.2 b/man2/clone.2
index 6aac374df..24c255db9 100644
--- a/man2/clone.2
+++ b/man2/clone.2
@@ -376,6 +376,7 @@ It is not permitted to specify both
 .B CLONE_NEWNS
 and
 .B CLONE_FS
+.\" See https://lwn.net/Articles/543273/
 in the same
 .BR clone ()
 call.