diff --git a/examples/json_typed.rs b/examples/json_typed.rs
index 44bc608..1c769d2 100644
--- a/examples/json_typed.rs
+++ b/examples/json_typed.rs
@@ -4,6 +4,7 @@
 //! Rust compile-time type system guaranties though it requires a little bit
 //! more code.
 
+// These require the `serde` dependency.
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
diff --git a/src/async_impl/response.rs b/src/async_impl/response.rs
index 1e095b8..fc6781c 100644
--- a/src/async_impl/response.rs
+++ b/src/async_impl/response.rs
@@ -210,6 +210,7 @@ impl Response {
     /// # use reqwest::Error;
     /// # use serde::Deserialize;
     /// #
+    /// // This `derive` requires the `serde` dependency.
     /// #[derive(Deserialize)]
     /// struct Ip {
     ///     origin: String,
diff --git a/src/blocking/response.rs b/src/blocking/response.rs
index 57ad638..4977539 100644
--- a/src/blocking/response.rs
+++ b/src/blocking/response.rs
@@ -196,6 +196,7 @@ impl Response {
     /// # use reqwest::Error;
     /// # use serde::Deserialize;
     /// #
+    /// // This `derive` requires the `serde` dependency.
     /// #[derive(Deserialize)]
     /// struct Ip {
     ///     origin: String,