diff --git a/examples/web_worker_fib/src/agent.rs b/examples/web_worker_fib/src/agent.rs
index 024d121cec9..afe6f6803e5 100644
--- a/examples/web_worker_fib/src/agent.rs
+++ b/examples/web_worker_fib/src/agent.rs
@@ -4,6 +4,7 @@ use wasm_bindgen::JsValue;
 use yew_agent::prelude::*;
 use yew_agent::Codec;
 
+/// Example to use a custom codec.
 pub struct Postcard;
 
 impl Codec for Postcard {