diff --git a/README.md b/README.md
index 8d892b4..ba21eaf 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,19 @@ xly-wiki/
 └── site/    共享生成输出，已被 git 忽略
 ```
 
+## 安装
+
+依赖只需安装一次，全部装在仓库根目录的 `.venv/` 中（已被 git 忽略，请勿提交）：
+
+```bash
+python3 -m venv .venv
+.venv/bin/pip install -r en/requirements.txt
+```
+
+`zh/requirements.txt` 与英文版相同；上面那条命令已经覆盖两种语言。
+
+如果之后修改了 `requirements.txt`（例如新增依赖），重新执行同一条 `pip install` 即可更新。
+
 ## 构建
 
 ```bash
@@ -61,6 +74,19 @@ xly-wiki/
 └── site/    shared generated output, ignored by git
 ```
 
+## Install
+
+Dependencies are installed once into a `.venv/` at the repo root (gitignored — do not commit it):
+
+```bash
+python3 -m venv .venv
+.venv/bin/pip install -r en/requirements.txt
+```
+
+`zh/requirements.txt` is identical to the English file, so the single command above covers both languages.
+
+If `requirements.txt` changes later (new dependency added), re-run the same `pip install` to refresh.
+
 ## Build
 
 ```bash