diff --git a/share/man/man9/mutex.9 b/share/man/man9/mutex.9
index 114b9b6df95..c7668b7177d 100644
--- a/share/man/man9/mutex.9
+++ b/share/man/man9/mutex.9
@@ -462,6 +462,10 @@ This option is used to quiet logging messages during individual mutex
 operations.
 This can be used to trim superfluous logging messages for debugging purposes.
 .El
+.Sh SEE ALSO
+.Xr sx 9   
+.EL
+.Ppo
 .Sh HISTORY
 These
 functions appeared in