diff --git a/substrate/client/consensus/babe/src/lib.rs b/substrate/client/consensus/babe/src/lib.rs
index d46486b1d8..de06f63848 100644
--- a/substrate/client/consensus/babe/src/lib.rs
+++ b/substrate/client/consensus/babe/src/lib.rs
@@ -54,7 +54,7 @@
 //! blocks) and will go with the longest one in case of a tie.
 //!
 //! An in-depth description and analysis of the protocol can be found here:
-//! <https://research.web3.foundation/en/latest/polkadot/BABE/Babe>
+//! <https://research.web3.foundation/en/latest/polkadot/BABE/Babe.html>
 
 #![forbid(unsafe_code)]
 #![warn(missing_docs)]