diff --git a/src/kdf.ts b/src/kdf.ts
index 6e0826f..6b0ec53 100644
--- a/src/kdf.ts
+++ b/src/kdf.ts
@@ -1,5 +1,6 @@
 import logger from 'log'
 import * as consts from './const'
+
 const log = logger('crypto:kdf')
 
 export enum Usage {