diff --git a/README.md b/README.md
index 0d60a7d..0d52cd4 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,19 @@
 
 提供webp生成服务
 
+```javascript
+// GET /webp/{type}-{id}-{version}-{width}-{height}-{fit}.{format}
+// @type: image avatar article article_attribute ad
+// @id: int 图片ID或是文章ID或是广告ID
+// @version: update_time 时间戳
+// @width: 宽度 1x 2x 3x 倍图直接输入尺寸
+// @height: 高度 1x 2x 3x 倍图直接输入尺寸
+// @fit: 裁切方式 cover contain fill auto
+
+// GET /img/{type}-{id}.{format}?width=320&height=320&fit=cover
+// 更优雅的实现, 使用查询参数的接口 (不幸的是CDN与OSS都不支持)
+```
+
 
 ## Update
 
diff --git a/models/mysql.go b/models/mysql.go
index 4088f0f..fa05841 100644
--- a/models/mysql.go
+++ b/models/mysql.go
@@ -39,7 +39,7 @@ func (m *MysqlConnection) GetImageContent(group string, id string) (content stri
 		err = m.db.QueryRow("SELECT image FROM web_article_attribute WHERE id=" + id).Scan(&content)
 	case "ad":
 		err = m.db.QueryRow("SELECT image FROM web_ad WHERE id=" + id).Scan(&content)
-	case "user":
+	case "avatar":
 		err = m.db.QueryRow("SELECT avatar FROM web_member WHERE id=" + id).Scan(&content)
 	case "image":
 		err = m.db.QueryRow("SELECT content FROM web_images WHERE id=" + id).Scan(&content)