--- a/toolkit/components/telemetry/docs/data/environment.rst
+++ b/toolkit/components/telemetry/docs/data/environment.rst
@@ -208,16 +208,17 @@ Structure:
             scope: <integer>,
             type: <string>, // "extension", "service", ...
             foreignInstall: <bool>,
             hasBinaryComponents: <bool>
             installDay: <number>, // days since UNIX epoch, 0 on failure
             updateDay: <number>, // days since UNIX epoch, 0 on failure
             signedState: <integer>, // whether the add-on is signed by AMO, only present for extensions
             isSystem: <bool>, // true if this is a System Add-on
+            isWebExtension: <bool>, // true if this is a WebExtension
           },
           ...
         },
         theme: { // the active theme
           id: <string>,
           blocklisted: <bool>,
           description: <string>,
           name: <string>,