diff --git a/README.md b/README.md
index 4fcd8388d..234c432c8 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ That's it!
 
 ## Deploy an App
 
-Right now Buildstep supports the Node.js and Ruby buildpacks. It's not hard to add more, [go add more](https://github.com/progrium/buildstep#adding-buildpacks)! Let's deploy
+Right now Buildstep supports the Node.js, Ruby and Java buildpacks. It's not hard to add more, [go add more](https://github.com/progrium/buildstep#adding-buildpacks)! Let's deploy
 the Heroku Node.js sample app. All you have to do is add a remote to name the app. It's created on-the-fly.
 
     $ cd node-js-sample
@@ -50,6 +50,18 @@ the Heroku Node.js sample app. All you have to do is add a remote to name the ap
 
 You're done!
 
+## Advanced installation (for development)
+
+The bootstrap script allows source git repository URLs to be overridden to include customizations from your own 
+repositories. The GITRECEIVE_URL, BUILDSTEP_REPO and DOKKU_REPO environment variables
+may be set to override the defaults (see the bootstrap.sh script for how these apply):
+
+Example:
+
+    $ wget j.mp/dokku-bootstrap
+    $ chmod +x bootstrap.sh
+    $ DOKKU_REPO=https://github.com/yourusername/dokku.git bootstrap.sh
+
 ## Components
 
  * [Docker](https://github.com/dotcloud/docker) - Container runtime and manager
diff --git a/bootstrap.sh b/bootstrap.sh
index db0cc7a63..6399016a4 100644
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,3 +1,9 @@
+# Repository locations - set environment variables to override defaults
+#  e.g. OVERRIDE_DOKKU_REPO=https://github.com/yourusername/dokku.git bootstrap.sh
+GITRECEIVE_URL=${GITRECEIVE_URL:-"https://raw.github.com/progrium/gitreceive/master/gitreceive"}
+BUILDSTEP_REPO=${BUILDSTEP_REPO:-"https://github.com/progrium/buildstep.git"}
+DOKKU_REPO=${DOKKU_REPO:-"https://github.com/progrium/dokku.git"}
+
 # Docker and base dependencies
 apt-get install -y linux-image-extra-`uname -r`
 apt-get install -y software-properties-common
@@ -8,20 +14,20 @@ apt-get install -y git ruby nginx make
 
 # gitreceive
 cd /usr/local/bin
-wget https://raw.github.com/progrium/gitreceive/master/gitreceive
+wget ${GITRECEIVE_URL}
 chmod +x gitreceive
 gitreceive init
 
 # buildstep
 cd ~
-git clone https://github.com/progrium/buildstep.git
+git clone ${BUILDSTEP_REPO}
 cd buildstep
 cp buildstep /home/git/buildstep
 make
 
 # dokku (this!)
 cd ~
-git clone https://github.com/progrium/dokku.git
+git clone ${DOKKU_REPO}
 cd dokku
 cp receiver /home/git/receiver
 cp nginx-app-conf /home/git/nginx-app-conf
diff --git a/receiver b/receiver
index 2c3cc2a2e..c142b036b 100755
--- a/receiver
+++ b/receiver
@@ -12,10 +12,10 @@ if [[ -f "$HOME/$1/PORT" ]]; then
 	OLDID=$(< "$HOME/$1/CONTAINER")
 	docker kill $OLDID > /dev/null
 	PORT=$(< "$HOME/$1/PORT")
-	ID=$(docker run -d -p ":$PORT" -e "PORT=$PORT" $APP /bin/bash -c "cd /app && ./start")
+	ID=$(docker run -d -p ":$PORT" -e "PORT=$PORT" $APP /bin/bash -c "if [ -d /app/.profile.d ]; then source /app/.profile.d/*; fi; cd /app && ./start")
 	echo $ID > "$HOME/$1/CONTAINER"
 else
-	ID=$(docker run -d -p 5000 -e PORT=5000 $APP /bin/bash -c "cd /app && ./start")
+	ID=$(docker run -d -p 5000 -e PORT=5000 $APP /bin/bash -c "if [ -d /app/.profile.d ]; then source /app/.profile.d/*; fi; cd /app && ./start")
 	echo $ID > "$HOME/$1/CONTAINER"
 	PORT=$(docker inspect $ID | ruby -e 'require"json";puts JSON.parse(STDIN.read)["NetworkSettings"]["PortMapping"]["5000"]')
 	echo $PORT > "$HOME/$1/PORT"
@@ -31,4 +31,4 @@ if [[ $DOMAIN ]]; then
 else
   echo "       http://$(hostname -i | cut -d' ' -f3):$PORT"
 fi
-echo
+echo
\ No newline at end of file