diff --git a/README.md b/README.md
index 78d0b99..e5e29cc 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,7 @@ Download the latest source of the interpreter and build it! It's quite easy to b
 
 Make sure thread model is `posix thread model`, otherwise no thread library exists.
 
+> mkdir build;
 > mingw32-make nasal.exe -j4
 
 ### __Windows (Visual Studio)__
diff --git a/doc/README_zh.md b/doc/README_zh.md
index e77f655..ea6a5e8 100644
--- a/doc/README_zh.md
+++ b/doc/README_zh.md
@@ -75,6 +75,7 @@ Windows 平台的预览版解释器现在还没配置相关流水线，
 
 确保 thread model 是 `posix thread model`, 否则没有 thread 库。
 
+> mkdir build;
 > mingw32-make nasal.exe -j4
 
 ### __Windows 平台 (Vistual Studio)__