diff --git a/pkg/util/memory_checker.go b/pkg/util/memory_checker.go
index 14081104e22..8132edadc85 100644
--- a/pkg/util/memory_checker.go
+++ b/pkg/util/memory_checker.go
@@ -29,6 +29,7 @@ func CheckMemoryUsage(limit float64) (bool, error) {
 	return stat.UsedPercent < limit, nil
 }
 
+// WaitMemoryAvailable waits until the memory usage is less than the limit.
 func WaitMemoryAvailable(limit float64, timeout time.Duration) error {
 	start := time.Now()
 	for {