diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go
index 1e6ff7ed94..40ade8d045 100644
--- a/internal/proxy/proxy.go
+++ b/internal/proxy/proxy.go
@@ -282,6 +282,7 @@ func (node *Proxy) sendChannelsTimeTickLoop() {
 	}()
 }
 
+// Start starts a proxy node.
 func (node *Proxy) Start() error {
 	err := InitMetaCache(node.rootCoord)
 	if err != nil {