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diff --git a/nixos/doc/manual/release-notes/rl-2205.section.md b/nixos/doc/manual/release-notes/rl-2205.section.md
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--- a/nixos/doc/manual/release-notes/rl-2205.section.md
+++ b/nixos/doc/manual/release-notes/rl-2205.section.md
@@ -128,6 +128,95 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The `mailpile` email webclient (`services.mailpile`) has been removed due to its reliance on python2.
 
+- The `matrix-synapse` service (`services.matrix-synapse`) has been converted to use the `settings` option defined in RFC42.
+  This means that options that are part of your `homeserver.yaml` configuration, and that were specified at the top-level of the
+  module (`services.matrix-synapse`) now need to be moved into `services.matrix-synapse.settings`. And while not all options you
+  may use are defined in there, they are still supported, because you can set arbitrary values in this freeform type.
+
+  An example to make the required migration clearer:
+
+  Before:
+  ```nix
+  {
+    services.matrix-synapse = {
+      enable = true;
+
+      server_name = "example.com";
+      public_baseurl = "https://example.com:8448";
+
+      enable_registration = false;
+      registration_shared_secret = "xohshaeyui8jic7uutuDogahkee3aehuaf6ei3Xouz4iicie5thie6nohNahceut";
+      macaroon_secret_key = "xoo8eder9seivukaiPh1cheikohquuw8Yooreid0The4aifahth3Ou0aiShaiz4l";
+
+      tls_certificate_path = "/var/lib/acme/example.com/fullchain.pem";
+      tls_certificate_path = "/var/lib/acme/example.com/fullchain.pem";
+
+      listeners = [ {
+        port = 8448;
+        bind_address = "";
+        type = "http";
+        tls = true;
+        resources = [ {
+          names = [ "client" ];
+          compress = true;
+        } {
+          names = [ "federation" ];
+          compress = false;
+        } ];
+      } ];
+
+    };
+  }
+  ```
+
+  After:
+  ```nix
+  {
+    services.matrix-synapse = {
+      enable = true;
+
+      # this attribute set holds all values that go into your homeserver.yaml configuration
+      # See https://github.com/matrix-org/synapse/blob/develop/docs/sample_config.yaml for
+      # possible values.
+      settings = {
+        server_name = "example.com";
+        public_baseurl = "https://example.com:8448";
+
+        enable_registration = false;
+        # pass `registration_shared_secret` and `macaroon_secret_key` via `extraConfigFiles` instead
+
+        tls_certificate_path = "/var/lib/acme/example.com/fullchain.pem";
+        tls_certificate_path = "/var/lib/acme/example.com/fullchain.pem";
+
+        listeners = [ {
+          port = 8448;
+          bind_address = [
+            "::"
+            "0.0.0.0"
+          ];
+          type = "http";
+          tls = true;
+          resources = [ {
+            names = [ "client" ];
+            compress = true;
+          } {
+            names = [ "federation" ];
+            compress = false;
+          } ];
+        } ];
+      };
+
+      extraConfigFiles = [
+        /run/keys/matrix-synapse/secrets.yaml
+      ];
+    };
+  }
+  ```
+
+  The secrets in your original config should be migrated into a YAML file that is included via `extraConfigFiles`.
+
+  Additionally a few option defaults have been synced up with upstream default values, for example the `max_upload_size` grew from `10M` to `50M`.
+
 - The MoinMoin wiki engine (`services.moinmoin`) has been removed, because Python 2 is being retired from nixpkgs.
 
 - The `wafHook` hook now honors `NIX_BUILD_CORES` when `enableParallelBuilding` is not set explicitly. Packages can restore the old behaviour by setting `enableParallelBuilding=false`.