Expand comparision with sp_staking::offence a bit

crates/sp-consensus-subspace/src/offence.rs

@@ -16,6 +16,14 @@
 
 //! Common traits and types that are useful for describing offences for usage in environments
 //! that use subspace consensus.
+//!
+//! ## Comparison with [sp_staking::offence]
+//!
+//! Unlike [sp_staking::offence] handles both the offline and equivocation offences, there is only
+//! equivocation attack in subspace as it's a permissionless consensus based on PoC holding to
+//! Nakamoto's vision and does not have a known validator set for the block production.
+//!
+//! [sp_staking::offence]: https://docs.substrate.io/rustdocs/latest/sp_staking/offence/index.html
 
 use codec::{Decode, Encode};
 use scale_info::TypeInfo;