diff --git a/docs/usage/README.md b/docs/usage/README.md
index ed88c54..b88299f 100644
--- a/docs/usage/README.md
+++ b/docs/usage/README.md
@@ -115,6 +115,16 @@ sidebar: auto
   开启，默认关
 - `BISON_USE_QUEUE`: 是否用队列的方式发送消息，降低发送频率，默认开
 - `BISON_RESEND_TIMES`: 最大重发次数，默认 0
+- `BISON_USE_PIC_MERGE`: 是否启用多图片时合并转发（仅限群）
+  - `0`: 不启用(默认)
+  - `1`: 首条消息单独发送，剩余图片合并转发
+  - `2`: 所有消息全部合并转发
+  ::: details 配置项示例
+  - 当`BISON_USE_PIC_MERGE=1`时:
+  ![simple1](./pic/forward-msg-simple1.png)
+  - 当`BISON_USE_PIC_MERGE=2`时:
+  ![simple1](./pic/forward-msg-simple2.png)
+  :::
 
 ## 使用
 
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