diff --git a/balancer/pickfirst/pickfirst.go b/balancer/pickfirst/pickfirst.go
index b229e92c2e90..a3ea329ee6fc 100644
--- a/balancer/pickfirst/pickfirst.go
+++ b/balancer/pickfirst/pickfirst.go
@@ -26,7 +26,7 @@ import (
 	"math/rand"
 
 	"google.golang.org/grpc/balancer"
-	_ "google.golang.org/grpc/balancer/pickfirst_leaf"
+	_ "google.golang.org/grpc/balancer/pickfirst_leaf" // For automatically registering the new pickfirst if required.
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal"