diff --git a/Client-Status.md b/Client-Status.md
index bf2bdb6..67fc520 100644
--- a/Client-Status.md
+++ b/Client-Status.md
@@ -5,6 +5,7 @@
 | Client | Type | Autodetect Addressbooks | Autodetect Calendars |
 |-|-|-|-|
 | [Thunderbird](../wiki/Client-Thunderbird) | Program | no (tested on 128.x) <br> yes (>= 137.x) (a) | yes (at least 128.x) |
+| [Thunderbird](../wiki/Client-Thunderbird) | Program with "CardBook" AddOn | (need to be checked) | n/a |
 | DAVx<sup>5</sup> | App | yes | yes |
 | [InfCloud](../wiki/Client-InfCloud) | WebUI | yes | yes |
 | [pimsync](../wiki/Client-pimsync) | CLI | yes | yes |