diff --git a/pages/common/groff.md b/pages/common/groff.md
index 5abfae2890..62857301a9 100644
--- a/pages/common/groff.md
+++ b/pages/common/groff.md
@@ -2,6 +2,7 @@
 
 > Typesetting program that reads plain text mixed with formatting commands and produces formatted output.
 > It is the GNU replacement for the `troff` and `nroff` Unix commands for text formatting.
+> More information: <https://www.gnu.org/software/groff>.
 
 - Render a man page as plain text, and display the result: