diff --git a/docs/USAGE_GUIDE.en.md b/docs/USAGE_GUIDE.en.md
index 4f9da54..f803c55 100644
--- a/docs/USAGE_GUIDE.en.md
+++ b/docs/USAGE_GUIDE.en.md
@@ -195,7 +195,7 @@ Steps:
 
 Go to **Agents** → `+ Add Sub-Agent` → set **Channel = Discord (thread only)**:
 
-![](redacted-screenshots/agents-discord-add-subagent.jpg)
+![](redacted-screenshots/agents-discord-add-subagent.png)
 
 Steps:
 1) Create a **thread** under the main channel (one thread per task)
diff --git a/docs/USAGE_GUIDE.zh-CN.md b/docs/USAGE_GUIDE.zh-CN.md
index 405f3dc..7c2cd15 100644
--- a/docs/USAGE_GUIDE.zh-CN.md
+++ b/docs/USAGE_GUIDE.zh-CN.md
@@ -178,7 +178,7 @@ OCM 也支持 Discord：
 
 进入 **Agents** → `+ Add Sub-Agent` → 选择 **渠道 = Discord (thread only)**：
 
-![](redacted-screenshots/agents-discord-add-subagent.jpg)
+![](redacted-screenshots/agents-discord-add-subagent.png)
 
 步骤：
 1) 在主 Channel 下新建 Thread（建议“一个任务一个 thread”）
diff --git a/docs/redacted-screenshots/agents-discord-add-subagent.jpg b/docs/redacted-screenshots/agents-discord-add-subagent.jpg
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