diff --git a/pages/linux/xclock.md b/pages/linux/xclock.md
index 239bffea9..540de88c7 100644
--- a/pages/linux/xclock.md
+++ b/pages/linux/xclock.md
@@ -1,6 +1,7 @@
 # xclock
 
 > Display the time in analog or digital form.
+> More information: <https://manned.org/xclock>.
 
 - Display an analog clock: