diff --git a/parser/Cargo.toml b/parser/Cargo.toml
index a0f8559..c389dea 100644
--- a/parser/Cargo.toml
+++ b/parser/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "yaml-rust"
-version = "0.4.0"
+version = "0.4.0" # remember to update html_root_url
 authors = ["Yuheng Chen <yuhengchen@sensetime.com>"]
 homepage = "http://chyh1990.github.io/yaml-rust/"
 documentation = "https://docs.rs/yaml-rust"
diff --git a/parser/src/lib.rs b/parser/src/lib.rs
index e3c9f64..d7967d1 100644
--- a/parser/src/lib.rs
+++ b/parser/src/lib.rs
@@ -36,6 +36,7 @@
 //!
 //! ```
 
+#![doc(html_root_url = "https://docs.rs/yaml-rust/0.4.0")]
 #![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
 #![cfg_attr(feature = "cargo-clippy", warn(cyclomatic_complexity))]
 #![cfg_attr(