diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 2f131514270dd5..5e337405c3e3f1 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -35,6 +35,12 @@ May 20, 2021
   - `api.TransitionEvent.animationName` ([#10336](https://github.com/mdn/browser-compat-data/pull/10336))
   - `api.Window.returnValue` ([#10449](https://github.com/mdn/browser-compat-data/pull/10449))
   - `api.WindowClient.ancestorOrigins` ([#10415](https://github.com/mdn/browser-compat-data/pull/10415))
+  - `css.at-rules.media.prefers-reduced-transparency` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+  - `css.at-rules.media.scan` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+  - `css.at-rules.media.update` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+  - `css.at-rules.page.bleed` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+  - `css.at-rules.page.marks` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+  - `css.at-rules.page.page-margin-boxes` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
 
 ## [v3.3.3](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.3)