diff --git a/README.md b/README.md
index 987ce62..d118955 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,9 @@ Set Debian packages server address. Choose a server from the list of Debian worl
 ##### `APT_PROXY`=""
 Set Proxy server address. Using a local Proxy-Cache like `apt-cacher-ng` will speed-up the bootstrapping process because all required Debian packages will only be downloaded from the Debian mirror site once.
 
+##### `APT_INCLUDES`=""
+A comma seperated list of additional packages to be installed during bootstrapping.
+
 #### General system settings:
 ##### `HOSTNAME`="rpi2-jessie"
 Set system host name. It's recommended that the host name is unique in the corresponding subnet.
diff --git a/rpi2-gen-image.sh b/rpi2-gen-image.sh
index ff677d2..a0f7313 100755
--- a/rpi2-gen-image.sh
+++ b/rpi2-gen-image.sh
@@ -82,7 +82,8 @@ REQUIRED_PACKAGES="debootstrap debian-archive-keyring qemu-user-static binfmt-su
 MISSING_PACKAGES=""
 
 # Packages required in the chroot build environment
-APT_INCLUDES="apt-transport-https,ca-certificates,debian-archive-keyring,dialog,sudo"
+APT_INCLUDES=${APT_INCLUDES:=""}
+APT_INCLUDES="${APT_INCLUDES},apt-transport-https,ca-certificates,debian-archive-keyring,dialog,sudo"
 
 set +x