diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index e3cefa4..94d0c17 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -6,6 +6,8 @@ Markdown-style links are now supported.
 
 The alt text in attachments that have one is also shown in a dropdown just below it (useful for environments where mouseover is not available, i.e. for phones and tablets).
 
+Instance-wide notifications has been implemented (contributed by louis77). A small tweak to the default CSS was made to suit this change; please consider updating your style.css.
+
 The avatar and/or the header images can now be deleted (contributed by louis77).
 
 Code cleaning: HTTP status codes use names instead of hardcoded integers (contributed by louis77).