diff --git a/README.md b/README.md
index 13b7e4b..c7735b2 100644
--- a/README.md
+++ b/README.md
@@ -59,8 +59,9 @@ End-to-end walkthrough in 5 steps:
 ```bash
 git clone https://github.com/ViperEkura/AstrAI.git
 cd AstrAI
-pip install -e .
-# pip install -e ".[dev]"    # optional: dev dependencies (pytest, ruff)
+pip install -e .                                          # pure PyTorch (no CUDA kernels)
+# CSRC_KERNELS=true pip install -e . --no-build-isolation  # optional: fused CUDA kernels
+# pip install -e ".[dev]"                                  # dev dependencies (pytest, ruff)
 ```
 
 **2. Download model**
diff --git a/assets/docs/README-zh-CN.md b/assets/docs/README-zh-CN.md
index 4ec6a45..495fe36 100644
--- a/assets/docs/README-zh-CN.md
+++ b/assets/docs/README-zh-CN.md
@@ -65,8 +65,9 @@
 ```bash
 git clone https://github.com/ViperEkura/AstrAI.git
 cd AstrAI
-pip install -e .
-# pip install -e ".[dev]"    # 可选：开发依赖（pytest, ruff）
+pip install -e .                                          # 纯 PyTorch（不含 CUDA 内核）
+# CSRC_KERNELS=true pip install -e . --no-build-isolation  # 可选：融合 CUDA 内核加速
+# pip install -e ".[dev]"                                  # 可选：开发依赖（pytest, ruff）
 ```
 
 **2. 下载模型**