diff --git a/src/lib.rs b/src/lib.rs
index d51005cfe..a898bd704 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,12 @@
 //! Actix web is a small, pragmatic, and extremely fast web framework
 //! for Rust.
 //!
+//! ## Example
+//!
+//! The `#[actix_rt::main]` macro in the example below is provided by the Actix runtime
+//! crate, [`actix-rt`](https://crates.io/crates/actix-rt). You will need to include
+//! `actix-rt` in your dependencies for it to run.
+//!
 //! ```rust,no_run
 //! use actix_web::{web, App, Responder, HttpServer};
 //!