diff --git a/README.md b/README.md
index db8678c..0abe33d 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ are discarded on reboot or upgrade.
 
 ## Overview
 
+```
 +-------------------------------------------------------------+
 | Physical disk                                               |
 | +-----------------------------------------+ +-------------+ |
@@ -27,6 +28,7 @@ are discarded on reboot or upgrade.
 | | +-----------------+ +-----------------+ | |             | |
 | +-----------------------------------------+ +-------------+ |
 +-------------------------------------------------------------+
+```
 
 ## Setup