diff --git a/.github/workflows/cfn-guard.yml b/.github/workflows/cfn-guard.yml
index 87955f3..ed3d1cc 100644
--- a/.github/workflows/cfn-guard.yml
+++ b/.github/workflows/cfn-guard.yml
@@ -4,6 +4,7 @@ on:
   push:
     paths:
       - 'cloudformation/**'
+      - 'cloudformation/**/**'
 
 jobs:
   cfn-guard:
diff --git a/.github/workflows/cloudformation.yml b/.github/workflows/cloudformation.yml
index 85634fa..eb904d4 100644
--- a/.github/workflows/cloudformation.yml
+++ b/.github/workflows/cloudformation.yml
@@ -4,6 +4,7 @@ on:
   push:
     paths:
       - 'cloudformation/**'
+      - 'cloudformation/**/**'
 
 jobs:
   deploy:
diff --git a/app/external/mock/cost_explorer.go b/app/external/mock/cost_explorer.go
index 3822ce8..684d309 100644
--- a/app/external/mock/cost_explorer.go
+++ b/app/external/mock/cost_explorer.go
@@ -1,3 +1,4 @@
+// Package mock is mock for external package.
 package mock
 
 import (
diff --git a/app/interactor/cost_explorer.go b/app/interactor/cost_explorer.go
index b53248a..e5ec57f 100644
--- a/app/interactor/cost_explorer.go
+++ b/app/interactor/cost_explorer.go
@@ -32,7 +32,7 @@ func NewCostGetter(c service.CostGetter) *CostGetter {
 // GetCost gets the cost.
 func (c *CostGetter) GetCost(ctx context.Context, input *usecase.CostGetterInput) (*usecase.CostGetterOutput, error) {
 	if input.End.Before(input.Start) {
-		return nil, errors.New("End date is before the start date")
+		return nil, errors.New("end date is before the start date")
 	}
 	output, err := c.CostGetter.GetCost(ctx, &service.CostGetterInput{
 		Start: input.Start,