document flake

README.md

@@ -33,4 +33,35 @@ body = { event_type = "build" }
 [[feed]]
 feed = "docker-hub://matrixdotorg/synapse"
 hook = "https://hook.example.com/hook2/call"
+```
+
+### Usage in NixOS
+
+A NixOS module is included and can be used like this:
+
+```nix
+{
+  inputs.rss-webhook-trigger.url = "github:icewind1991/rss-webhook-trigger";
+
+  outputs = { self, nixpkgs, rss-webhook-trigger }: {
+    nixosConfigurations.my-machine = nixpkgs.lib.nixosSystem {
+      modules =
+        [ 
+          rss-webhook-trigger.nixosModules.default
+          {
+            services.rss-webhook-trigger = {
+              enable = true;
+              hooks = [
+                {
+                  feed = "https://example.com/feed1.xml";
+                  hook = "https://hook.example.com/hook1/call";
+                }
+              ];
+            };
+          }
+          # ... other configuration ...
+        ];
+    };
+  };
+}
 ```