diff --git a/util/gctuner/tuner.go b/util/gctuner/tuner.go
index 32111ffcf6940..2ee3679ef2363 100644
--- a/util/gctuner/tuner.go
+++ b/util/gctuner/tuner.go
@@ -41,6 +41,7 @@ func init() {
 	}
 }
 
+// SetDefaultGOGC is to set the default GOGC value.
 func SetDefaultGOGC() {
 	util.SetGOGC(int(defaultGCPercent))
 }