diff --git a/src/lib.rs b/src/lib.rs
index 650044f..2ca1707 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,5 @@
-#![feature(external_doc)]
-#![doc(include = "../README.md")] // This also allow to run examples in that file.
+#![feature(extended_key_value_attributes)]
+#![doc = include_str!("../README.md")] // This also allow to run examples in that file.
 
 #![allow(unsafe_code)]
 #![warn(missing_docs)]