diff --git a/src/file-list/files.json b/src/file-list/files.json
index cce4914..32d2c5f 100644
--- a/src/file-list/files.json
+++ b/src/file-list/files.json
@@ -3,5 +3,15 @@
     "name": "test.txt",
     "size": 1024,
     "directory": false
+  },
+  {
+    "name": "folder 1",
+    "directory": true
+  },
+  {
+    "name": "picture.jpg",
+    "thumbnail": "",
+    "size": 2048,
+    "directory": false
   }
 ]
diff --git a/src/file-list/index.ts b/src/file-list/index.ts
index ac4c113..1cc4385 100644
--- a/src/file-list/index.ts
+++ b/src/file-list/index.ts
@@ -11,7 +11,8 @@ export interface IOptions extends IComponentOptions {
 
 export interface IFile {
   name: string
-  size: number
+  thumbnail?: string
+  size?: number
   directory: boolean
 }