diff --git a/README.md b/README.md
index 74254cb..7f934e5 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,12 @@ git clone https://github.com/YunoHost/yunohost-debootstrap
 sudo cp yunohost-debootstrap/yunohost /usr/share/debootstrap/scripts/
 ```
 
+## Patch debootstrap
+You need to patch debootstrap like this:
+```
+sed -i "s@#\!/bin/bash@#\!/bin/sh@" /usr/sbin/debootstrap
+```
+
 ## Test it
 ```
 mkdir ynh_chroot