diff --git a/usr.bin/colldef/colldef.1 b/usr.bin/colldef/colldef.1
index d7e7998c8cd8..da082112bb6f 100644
--- a/usr.bin/colldef/colldef.1
+++ b/usr.bin/colldef/colldef.1
@@ -245,5 +245,6 @@ standard shared location  for  collation  orders
 under the locale locale
 .Sh SEE ALSO
 .Xr mklocale 1 ,
+.Xr setlocale 3 ,
 .Xr strcoll 3 ,
 .Xr strxfrm 3