diff --git a/pallets/external-validators-rewards/src/lib.rs b/pallets/external-validators-rewards/src/lib.rs
index 7fef30453..4888c206a 100644
--- a/pallets/external-validators-rewards/src/lib.rs
+++ b/pallets/external-validators-rewards/src/lib.rs
@@ -87,6 +87,7 @@ pub mod pallet {
     }
 
     /// Store reward points per era.
+    /// Note: EraRewardPoints is actually bounded by the amount of validators.
     #[pallet::storage]
     #[pallet::unbounded]
     pub type RewardPointsForEra<T: Config> =