diff --git a/editions/tw5.com/tiddlers/mechanisms/Background Actions.tid b/editions/tw5.com/tiddlers/mechanisms/Background Actions.tid
index 1a8722d17..07b8e32c4 100644
--- a/editions/tw5.com/tiddlers/mechanisms/Background Actions.tid	
+++ b/editions/tw5.com/tiddlers/mechanisms/Background Actions.tid	
@@ -1,6 +1,7 @@
 title: Background Actions
 created: 20250212154426403
 modified: 20250212154426403
+tags: Mechanisms
 
 <<.demo-tiddler """
 title: SampleBackgroundAction: Story Change
diff --git a/editions/tw5.com/tiddlers/mechanisms/MediaQueryTrackerMechanism.tid b/editions/tw5.com/tiddlers/mechanisms/MediaQueryTrackerMechanism.tid
index 1944a7e0a..f95219b0d 100644
--- a/editions/tw5.com/tiddlers/mechanisms/MediaQueryTrackerMechanism.tid
+++ b/editions/tw5.com/tiddlers/mechanisms/MediaQueryTrackerMechanism.tid
@@ -1,5 +1,8 @@
 title: Media Query Tracker Mechanism
 tags: Mechanisms
+created: 20250212154426403
+modified: 20250212154426403
+
 
 <<.from-version "5.4.0">> The media query tracker mechanism allows you to define [[custom CSS media queries|https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_media_queries/Using_media_queries]] to be bound to a specified [[info|InfoMechanism]] tiddler. The info tiddler will be dynamically update to reflect the current state of the media query.
 
diff --git a/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9641.tid b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9641.tid
new file mode 100644
index 000000000..bdf0eed7b
--- /dev/null
+++ b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#9641.tid
@@ -0,0 +1,14 @@
+title: $:/changenotes/5.4.0/#9641
+description: Background actions and media query tracking
+tags: $:/tags/ChangeNote
+release: 5.4.0
+change-type: enhancement
+change-category: internal
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9641
+github-contributors: Jermolene
+
+Introduces[[Background Actions]] that are triggered whenever there is a change to the results of a specified filter.
+
+Building on that, it also introduces a new [[Media Query Tracker Mechanism]] that can track the results of any CSS media query (not just dark mode), storing the results in a shadow `$:/info/...` tiddler
+
+These improvements were cherrypicked from [[#8702 - Colour Handling Improvements|https://github.com/TiddlyWiki/TiddlyWiki5/pull/8702]] when it was deferred until v5.5.0.