diff --git a/kv/variables.go b/kv/variables.go
index a461d3216a42a..373421826dacb 100644
--- a/kv/variables.go
+++ b/kv/variables.go
@@ -18,7 +18,7 @@ type Variables struct {
 	// BackoffLockFast specifies the LockFast backoff base duration in milliseconds.
 	BackoffLockFast int
 
-	// BackOffWeight specifies the weight of the max back off time duration in milliseconds.
+	// BackOffWeight specifies the weight of the max back off time duration.
 	BackOffWeight int
 
 	// Hook is used for test to verify the variable take effect.