diff --git a/server/config/config.go b/server/config/config.go
index 5b9088ac8ea..0485e077c67 100644
--- a/server/config/config.go
+++ b/server/config/config.go
@@ -505,7 +505,7 @@ type PDServerConfig struct {
 	// RuntimeServices is the running extension services.
 	RuntimeServices typeutil.StringSlice `toml:"runtime-services" json:"runtime-services"`
 	// MetricStorage is the cluster metric storage.
-	// Currently we use prometheus as metric storage, we may use PD/TiKV as metric storage later.
+	// Currently, we use prometheus as metric storage, we may use PD/TiKV as metric storage later.
 	MetricStorage string `toml:"metric-storage" json:"metric-storage"`
 	// There are some values supported: "auto", "none", or a specific address, default: "auto"
 	DashboardAddress string `toml:"dashboard-address" json:"dashboard-address"`
diff --git a/tests/dashboard/service_test.go b/tests/dashboard/service_test.go
index ab3a2c431cb..5f72efb2c36 100644
--- a/tests/dashboard/service_test.go
+++ b/tests/dashboard/service_test.go
@@ -86,7 +86,8 @@ func (suite *dashboardTestSuite) checkRespCode(url string, code int) {
 }
 
 func waitForConfigSync() {
-	time.Sleep(time.Second)
+	// Need to wait dashboard service start.
+	time.Sleep(3 * time.Second)
 }
 
 func (suite *dashboardTestSuite) checkServiceIsStarted(internalProxy bool, servers map[string]*tests.TestServer, leader *tests.TestServer) string {