diff --git a/board/csky/readme.txt b/board/csky/readme.txt
index b4605c541e..dc82dcc1d7 100644
--- a/board/csky/readme.txt
+++ b/board/csky/readme.txt
@@ -41,9 +41,9 @@ Result of the build
 After building, you should obtain this tree:
 
     output/images/
-    ├── vmlinux
-    ├── rootfs.ext2
-    └── <board name>.dtb
+    +-- vmlinux
+    +-- rootfs.ext2
+    +-- <board name>.dtb
 
 How to run it
 =============