diff --git a/src/lib.rs b/src/lib.rs
index e377a38..8441fe7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,5 @@
-#![ cfg_attr( nightly, feature( external_doc, doc_cfg    ) ) ]
-#![ cfg_attr( nightly, doc    ( include = "../README.md" ) ) ]
+#![ cfg_attr( nightly, feature( doc_cfg ) ) ]
+#![ cfg_attr( nightly, cfg_attr( nightly, doc = include_str!("../README.md") ) )]
 #![ doc = "" ] // empty doc line to handle missing doc warning when the feature is missing.
 
 #![ doc    ( html_root_url = "https://docs.rs/pharos" ) ]