diff --git a/i18n-node/i18n-node.d.ts b/i18n-node/i18n-node.d.ts
index 348c2f2689..79dda8b758 100644
--- a/i18n-node/i18n-node.d.ts
+++ b/i18n-node/i18n-node.d.ts
@@ -22,29 +22,34 @@ declare module i18n {
          */
         directory?: string;
 
-        /** 
+        /**
          * whether to write new locale information to disk
          * @default true
          */
         updateFiles?: boolean;
 
-        /** 
+        /**
          * What to use as the indentation unit
          * @default "\t"
          */
         indent?: string;
 
-        /** 
+        /**
          * Setting extension of json files (you might want to set this to '.js' according to webtranslateit)
          * @default ".json"
          */
         extension?: string;
 
-        /** 
+        /**
          * Enable object notation
          * @default false
          */
         objectNotation?: boolean;
+
+        /**
+         * json files prefix
+         */
+        prefix?: string;
     }
     export interface TranslateOptions {
         phrase: string;