diff --git a/substrate/frame/staking/src/slashing.rs b/substrate/frame/staking/src/slashing.rs
index 2b2ac61356..fd0a63b288 100644
--- a/substrate/frame/staking/src/slashing.rs
+++ b/substrate/frame/staking/src/slashing.rs
@@ -47,7 +47,7 @@
 //! has multiple misbehaviors. However, accounting for such cases is necessary
 //! to deter a class of "rage-quit" attacks.
 //!
-//! Based on research at <https://research.web3.foundation/en/latest/polkadot/slashing/npos/>
+//! Based on research at <https://w3f-research.readthedocs.io/en/latest/polkadot/slashing/npos.html>
 
 use super::{
 	EraIndex, Config, Module, Store, BalanceOf, Exposure, Perbill, SessionInterface,