diff --git a/system-parachains/bridge-hubs/bridge-hub-kusama/src/bridge_to_ethereum_config.rs b/system-parachains/bridge-hubs/bridge-hub-kusama/src/bridge_to_ethereum_config.rs
index 4e9851f6ac..84d2687572 100644
--- a/system-parachains/bridge-hubs/bridge-hub-kusama/src/bridge_to_ethereum_config.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-kusama/src/bridge_to_ethereum_config.rs
@@ -139,6 +139,9 @@ parameter_types! {
 }
 
 parameter_types! {
+	// On Ethereum, a sync committee period spans 8192 slots, approximately 27 hours (or 256 epochs).
+	// We retain headers for 20 sync committee periods, equating to about 3 weeks. Headers older
+	// than this period are pruned.
 	pub const MaxExecutionHeadersToKeep: u32 = 8192 * 20;
 }
 
diff --git a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/bridge_to_ethereum_config.rs b/system-parachains/bridge-hubs/bridge-hub-polkadot/src/bridge_to_ethereum_config.rs
index c44c0862de..275dca00c8 100644
--- a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/bridge_to_ethereum_config.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-polkadot/src/bridge_to_ethereum_config.rs
@@ -139,6 +139,9 @@ parameter_types! {
 }
 
 parameter_types! {
+	// On Ethereum, a sync committee period spans 8192 slots, approximately 27 hours (or 256 epochs).
+	// We retain headers for 20 sync committee periods, equating to about 3 weeks. Headers older
+	// than this period are pruned.
 	pub const MaxExecutionHeadersToKeep: u32 = 8192 * 20;
 }