diff --git a/symfony/matrix-notifier/7.3/manifest.json b/symfony/matrix-notifier/7.3/manifest.json
new file mode 100644
index 000000000..18448b864
--- /dev/null
+++ b/symfony/matrix-notifier/7.3/manifest.json
@@ -0,0 +1,14 @@
+{
+    "add-lines": [
+        {
+            "file": "config/packages/notifier.yaml",
+            "position": "after_target",
+            "warn_if_missing": true,
+            "target": "        chatter_transports:",
+            "content": "            matrix: '%env(MATRIX_DSN)%'"
+        }
+    ],
+    "env": {
+        "#1": "MATRIX_DSN=matrix://HOST:PORT/?accessToken=ACCESSTOKEN&ssl=SSL"
+    }
+}