diff --git a/README.md b/README.md
index 7cf4147..53982dd 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ Download the addon from [here](https://banananet.work/downloads/lez-plus-css.xpi
 go to the [Addon Manager](about:addons)
 and select *Install addon From File ...*.
 
+Note: Addon is checked & signed by Mozilla, see [Validation Result](https://addons.mozilla.org/en-US/developers/addon/c511b2994ca246058b0c/file/3039858/validation).
+
 ### Google Chrome
 
 Clone the repository to your computer and install the extension in your browser as temporary / unpacked extension.