diff --git a/package.json b/package.json
index d4f9523..1fc9255 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "touhou-tagger",
-  "version": "1.6.0",
+  "version": "1.7.0-beta.0",
   "description": "从 THBWiki 自动填写东方 Project CD 曲目信息.",
   "main": "dist/core/index.js",
   "bin": {
diff --git a/src/core/metadata/metadata.ts b/src/core/metadata/metadata.ts
index 629e5ba..a181ca7 100644
--- a/src/core/metadata/metadata.ts
+++ b/src/core/metadata/metadata.ts
@@ -5,6 +5,7 @@ export interface AlbumMetadata {
   genres?: string[]
   year?: string
   coverImage?: Buffer
+  extraData?: Record<string, unknown>
 }
 export interface Metadata extends AlbumMetadata {
   title: string