diff --git a/README.md b/README.md
index 22ae6dd..db7596b 100644
--- a/README.md
+++ b/README.md
@@ -36,10 +36,15 @@ npx github:cexll/myclaude
 # List installable items (modules / skills / wrapper)
 npx github:cexll/myclaude --list
 
+# Detect installed modules and update from GitHub
+npx github:cexll/myclaude --update
+
 # Custom install directory / overwrite
 npx github:cexll/myclaude --install-dir ~/.claude --force
 ```
 
+`--update` detects already installed modules in the target install dir (defaults to `~/.claude`, via `installed_modules.json` when present) and updates them from GitHub (latest release) by overwriting the module files.
+
 ### Module Configuration
 
 Edit `config.json` to enable/disable modules:
diff --git a/README_CN.md b/README_CN.md
index d6351fe..c92d498 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -174,10 +174,15 @@ npx github:cexll/myclaude
 # 列出可安装项（module:* / skill:* / codeagent-wrapper）
 npx github:cexll/myclaude --list
 
+# 检测已安装 modules 并从 GitHub 更新
+npx github:cexll/myclaude --update
+
 # 指定安装目录 / 强制覆盖
 npx github:cexll/myclaude --install-dir ~/.claude --force
 ```
 
+`--update` 会在目标安装目录（默认 `~/.claude`，优先读取 `installed_modules.json`）检测已安装 modules，并从 GitHub 拉取最新发布版本覆盖更新。
+
 ### 模块配置
 
 编辑 `config.json` 启用/禁用模块：