diff --git a/lib/libc/sys/mkdir.2 b/lib/libc/sys/mkdir.2
index d526842a3b6..cafbbd140ab 100644
--- a/lib/libc/sys/mkdir.2
+++ b/lib/libc/sys/mkdir.2
@@ -110,6 +110,7 @@ argument
 points outside the process's allocated address space.
 .El
 .Sh SEE ALSO
+.Xr chflags 2 ,
 .Xr chmod 2 ,
 .Xr stat 2 ,
 .Xr umask 2