diff --git a/pages/common/gcal.md b/pages/common/gcal.md
index e0a39e89b6..26ab674c9a 100644
--- a/pages/common/gcal.md
+++ b/pages/common/gcal.md
@@ -1,6 +1,7 @@
 # gcal
 
 > Displays calendar.
+> More information: <https://www.gnu.org/software/gcal>.
 
 - Display calendar for the current month: