diff --git a/src/lib.rs b/src/lib.rs
index 40c6192..4d2b4d1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,6 +38,7 @@
     html_logo_url = "https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png"
 )]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![feature(doc_cfg)]
 
 use std::fmt;
 use std::marker::PhantomData;