diff --git a/README.md b/README.md
index abac2fa..3ab9ed4 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,9 @@ Released versions can be downloaded from https://addons.mozilla.org/firefox/addo
 
 Beta versions are sometimes available from https://addons.mozilla.org/firefox/addon/open-with/versions/beta
 
+### Thunderbird
+Released versions can be downloaded from https://addons.thunderbird.net/thunderbird/addon/open-with/
+
 ### Chrome/Chromium
 Download from the Chrome store https://chrome.google.com/webstore/detail/open-with/cogjlncmljjnjpbgppagklanlcbchlno. This version also works in Opera.