diff --git a/viz-core/src/handler.rs b/viz-core/src/handler.rs
index b022642e..0a18d756 100644
--- a/viz-core/src/handler.rs
+++ b/viz-core/src/handler.rs
@@ -111,7 +111,9 @@ pub trait HandlerExt<I>: Handler<I> {
         Map::new(self, f)
     }
 
-    /// Maps the handler's output type to the [`Response`][crate::Response].
+    /// Maps the handler's output type to the [`Response`].
+    ///
+    /// [`Response`]: crate::Response
     fn map_into_response(self) -> MapInToResponse<Self>
     where
         Self: Sized,
@@ -169,7 +171,6 @@ pub trait HandlerExt<I>: Handler<I> {
     }
 
     /// Maps the handler.
-    #[must_use]
     fn with_fn<F>(self, f: F) -> Self
     where
         F: Fn(Self) -> Self,
diff --git a/viz/src/lib.rs b/viz/src/lib.rs
index 3ec2b174..7f423a8c 100644
--- a/viz/src/lib.rs
+++ b/viz/src/lib.rs
@@ -145,8 +145,9 @@
 //!
 //! But it's still recommended to use `into_handler` for conversion.
 //!
-//! ```ignore
+//! ```
 //! # use viz::{handler, types::Params, IntoHandler, IntoResponse, Result, Router};
+//!
 //! #[handler]
 //! async fn show_user(Params(id): Params<u64>) -> Result<impl IntoResponse> {
 //!     Ok(format!("Hi, NO.{}", id))
@@ -166,7 +167,7 @@
 //! The [`HandlerExt`] is an extension trait for [Handler]s that provides a variety of convenient
 //! combinator functions.
 //!
-//! Likes the [`FutureExt`] and [`StreamExt`] trait.
+//! Likes the [`FutureExt`] and [`StreamExt`] traits.
 //!
 //! ```
 //! # use viz::{