diff --git a/README-ja.md b/README-ja.md
index d945a34ac..12c9c47bd 100644
--- a/README-ja.md
+++ b/README-ja.md
@@ -69,7 +69,13 @@ cd duo-buildroot-sdk/
 
 ### <2>. 手動コンパイル
 
-手動コンパイルをしたい場合は以下のコマンドを順に実行します。
+If you have not executed the one-click compilation script, you need to manually download the toolchain [host-tools](https://sophon-file.sophon.cn/sophon-prod-s3/drive/23/03/07/16/host-tools.tar.gz) and extract it to the SDK root directory:
+
+```
+tar -xf host-tools.tar.gz -C /your/sdk/path/
+```
+
+Then enter the following commands sequentially:
 
 ```bash
 export MILKV_BOARD=milkv-duo
diff --git a/README-zh.md b/README-zh.md
index 91ba7f49f..532b75904 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -66,7 +66,13 @@ cd duo-buildroot-sdk/
 
 ### 2、分步编译
 
-可依次输入如下命令：
+如果未执行过一键编译脚本，需要先手动下载工具链 [host-tools](https://sophon-file.sophon.cn/sophon-prod-s3/drive/23/03/07/16/host-tools.tar.gz)，并解压到 SDK 根目录：
+
+```
+tar -xf host-tools.tar.gz -C /your/sdk/path/
+```
+
+再依次输入如下命令完成分步编译：
 
 ```bash
 export MILKV_BOARD=milkv-duo
diff --git a/README.md b/README.md
index e729fbdf0..ac19dcc12 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,13 @@ cd duo-buildroot-sdk/
 
 ### <2>. Step-by-step Compilation
 
-If you wish to perform step-by-step compilation, you can enter the following commands sequentially:
+If you have not executed the one-click compilation script, you need to manually download the toolchain [host-tools](https://sophon-file.sophon.cn/sophon-prod-s3/drive/23/03/07/16/host-tools.tar.gz) and extract it to the SDK root directory:
+
+```
+tar -xf host-tools.tar.gz -C /your/sdk/path/
+```
+
+Then enter the following commands sequentially:
 
 ```bash
 export MILKV_BOARD=milkv-duo