diff --git a/rc.lua b/rc.lua
index 8552897..b650555 100644
--- a/rc.lua
+++ b/rc.lua
@@ -527,6 +527,8 @@ awful.rules.rules = {
       properties = { tag = tags[1][1] } },
     { rule = { class = "Firefox" },
       properties = { tag = tags[1][2] } },
+    { rule = { class = "Thunderbird" },
+      properties = { tag = tags[1][2] } },
     { rule = { class = "VirtualBox" },
       properties = { tag = tags[1][3] } },
     { rule = { class = "Remmina" },