diff --git a/src/lib.rs b/src/lib.rs
index 2c6f868..e022d35 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,4 @@
-#![cfg_attr(feature = "nightly", feature(external_doc))]
-#![cfg_attr(feature = "nightly", doc(include = "../README.md"))]
+#![doc = include_str!("../README.md")]
 
 use std::convert::TryFrom;