diff --git a/crates/oxc_index/src/lib.rs b/crates/oxc_index/src/lib.rs
index b03ed1e50..10e90965c 100644
--- a/crates/oxc_index/src/lib.rs
+++ b/crates/oxc_index/src/lib.rs
@@ -1,6 +1,6 @@
 //! Indexing Utilities
 //!
-//! <https://github.com/rust-lang/rust/tree/master/compiler/rustc_index>
+//! <https://doc.rust-lang.org/beta/nightly-rustc/rustc_index>
 
 pub use index_vec::{define_index_type, index_vec, IndexSlice, IndexVec};
 pub use static_assertions::*;
diff --git a/crates/oxc_span/src/lib.rs b/crates/oxc_span/src/lib.rs
index cc3e9cdf3..4dfafeb7e 100644
--- a/crates/oxc_span/src/lib.rs
+++ b/crates/oxc_span/src/lib.rs
@@ -1,3 +1,7 @@
+//! Source positions and related helper functions.
+//!
+//! <https://doc.rust-lang.org/beta/nightly-rustc/rustc_span>
+
 mod atom;
 mod source_type;
 mod span;