diff --git a/man7/locale.7 b/man7/locale.7
index 38c3755fb..cdb120dea 100644
--- a/man7/locale.7
+++ b/man7/locale.7
@@ -212,6 +212,7 @@ The GNU gettext functions are specified in LI18NUX2000.
 .SH SEE ALSO
 .BR locale (1),
 .BR localedef (1),
+.BR catopen (3),
 .BR gettext (3),
 .BR localeconv (3),
 .BR ngettext (3),