diff --git a/src/endpoint.rs b/src/endpoint.rs
index 7088879..31500aa 100644
--- a/src/endpoint.rs
+++ b/src/endpoint.rs
@@ -35,6 +35,9 @@ impl<M: Message + 'static> EndpointHandler<M> for () {
 
 // ----
 
+/// This trait should be implemented by an object of your application
+/// that can handle a message of type `M`, in the cases where it doesn't
+/// care about attached stream in the request nor in the response.
 #[async_trait]
 pub trait EndpointHandler<M>: Send + Sync
 where