diff --git a/source__build_carla.md b/source__build_carla.md
index ac29dd3..08f5f20 100644
--- a/source__build_carla.md
+++ b/source__build_carla.md
@@ -92,7 +92,7 @@ pip3 install --user wheel auditwheel==4.0.0
 ## 编译unreaEngine
 
 ```shell
-git clone --depth 1 -b carla https://github.com/CarlaUnreal/UnrealEngine.git .
+git clone --depth 1 -b carla https://github.com/CarlaUnreal/UnrealEngine.git 
 ```
 
 克隆这一步网上说了一大堆，包括官方，还要切换分支之类的，根本不需要，直接克隆最新的就行，因为后面克隆carla源码是也是克隆最新的。这样不会缺少对应的依赖