diff --git a/README.md b/README.md
index 2aec29c687..b8cbd00f7d 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ A concurrency framework for building real time systems.
 
 - Applications must be written using the 2018 edition.
 
-## [User documentation](https://japaric.github.io/cortex-m-rtfm/book/)
+## [User documentation](https://japaric.github.io/cortex-m-rtfm/book/en)
 
 ## [API reference](https://japaric.github.io/cortex-m-rtfm/api/rtfm/index.html)