diff --git a/pages/common/thunderbird.md b/pages/common/thunderbird.md
index 4058d9cc9..b5ad28015 100644
--- a/pages/common/thunderbird.md
+++ b/pages/common/thunderbird.md
@@ -1,6 +1,7 @@
 # thunderbird
 
 > Email client and RSS reader.
+> More information: <https://thunderbird.net>.
 
 - Open thunderbird: