diff --git a/packages/marko/docs/fastify.md b/packages/marko/docs/fastify.md
index ec66d063a..8e0d02c6c 100644
--- a/packages/marko/docs/fastify.md
+++ b/packages/marko/docs/fastify.md
@@ -40,7 +40,16 @@ app.get("/", (request, reply) => {
 
 await fastify.listen(3000);
 ```
+### Global Outputs
+We can add global outputs from the server side using the reply object or fastify instance.
+```javascript
+reply.locals.newProperty = 'Your value';
+```
 
+To use this in marko components we just need to refer out.global
+```marko.js
+$ const { newProperty } = out.global;
+```
 ### BYOB (Bring your own bundler)
 
 For the large portion of Marko's API a bundler is required. The example code above assumes that Marko templates can be loaded in your environment.