diff --git a/rollup/internal/controller/relayer/l1_relayer.go b/rollup/internal/controller/relayer/l1_relayer.go
index 921ccec4f2..df28475c46 100644
--- a/rollup/internal/controller/relayer/l1_relayer.go
+++ b/rollup/internal/controller/relayer/l1_relayer.go
@@ -21,12 +21,9 @@ import (
 	"scroll-tech/rollup/internal/orm"
 )
 
-// Layer1Relayer is responsible for
-//  1. fetch pending L1Message from db
-//  2. relay pending message to layer 2 node
+// Layer1Relayer is responsible for updating L1 gas price oracle contract on L2.
 //
-// Actions are triggered by new head from layer 1 geth node.
-// @todo It's better to be triggered by watcher.
+// Actions are triggered by L1 watcher.
 type Layer1Relayer struct {
 	ctx context.Context
 
diff --git a/rollup/internal/controller/relayer/l2_relayer.go b/rollup/internal/controller/relayer/l2_relayer.go
index d49f136d67..eacb11f8aa 100644
--- a/rollup/internal/controller/relayer/l2_relayer.go
+++ b/rollup/internal/controller/relayer/l2_relayer.go
@@ -34,7 +34,9 @@ import (
 	rutils "scroll-tech/rollup/internal/utils"
 )
 
-// Layer2Relayer is responsible for committing and finalizing L2 blocks on L1.
+// Layer2Relayer is responsible for:
+// i. committing and finalizing L2 blocks on L1.
+// ii. updating L2 gas price oracle contract on L1.
 type Layer2Relayer struct {
 	ctx context.Context