diff --git a/README.md b/README.md
index 834bb66..d2b74d9 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Installation
 ```
 git clone git://github.com/YunoHost/cd_build.git
 cd cd_build
-sudo apt-get install -f simple-cdd genisoimage qemu-kvm xorriso syslinux-utils
+sudo apt-get install -f simple-cdd genisoimage qemu-kvm xorriso syslinux-utils cpio
 ```
 
 Build an image