diff --git a/core/lib/src/serde/msgpack.rs b/core/lib/src/serde/msgpack.rs
index 7985d5ec..acf76433 100644
--- a/core/lib/src/serde/msgpack.rs
+++ b/core/lib/src/serde/msgpack.rs
@@ -4,8 +4,8 @@
 //!
 //! # Enabling
 //!
-//! This module is only available when the `json` feature is enabled. Enable it
-//! in `Cargo.toml` as follows:
+//! This module is only available when the `msgpack` feature is enabled. Enable
+//! it in `Cargo.toml` as follows:
 //!
 //! ```toml
 //! [dependencies.rocket]