diff --git a/webextensions/api/declarativeNetRequest.json b/webextensions/api/declarativeNetRequest.json
index 89c6586adfe8f..8753685a1f74f 100644
--- a/webextensions/api/declarativeNetRequest.json
+++ b/webextensions/api/declarativeNetRequest.json
@@ -144,7 +144,8 @@
             "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest/MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES",
             "support": {
               "chrome": {
-                "version_added": "90"
+                "version_added": "90",
+                "notes": "Deprecated in Chrome 120"
               },
               "edge": "mirror",
               "firefox": {