From b348673a1572c75009fdb966324954a8181dd005 Mon Sep 17 00:00:00 2001
From: "Daniel D. Beck" <daniel@ddbeck.com>
Date: Fri, 10 Sep 2021 16:15:35 +0100
Subject: [PATCH] Add release note for
 https://github.com/mdn/browser-compat-data/pull/12276

---
 RELEASE_NOTES.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index b07ea2a3584529..8b5325ceb42b36 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -6,7 +6,10 @@ RELEASE DATE TK
 
 ### Notable changes
 
-- The historic `api.IDBEnvironment` mixin has been removed. ([#12230](https://github.com/mdn/browser-compat-data/pull/12230))
+- The following non-existent, long-removed, or otherwise irrelevant features have been removed:
+
+  - `api.Document.documentURI.readonly` ([#12276](https://github.com/mdn/browser-compat-data/pull/12276))
+  - `api.IDBEnvironment` ([#12230](https://github.com/mdn/browser-compat-data/pull/12230))
 
 ### Known issues