diff --git a/71-apt-cacher-ng b/71-apt-cacher-ng
index 354c988..6c86004 100644
--- a/71-apt-cacher-ng
+++ b/71-apt-cacher-ng
@@ -1 +1,6 @@
-Acquire::http { Proxy "http://192.168.1.13:3142"; };
+# Uncomment the Acquire line below and then
+# Modify the host to match your needs if you wish to
+# use apt-cacher in your image build out (and the 
+# Subsequent running container.
+
+#Acquire::http { Proxy "http://192.168.1.13:3142"; };
diff --git a/README.md b/README.md
index 5807796..6c2a74e 100644
--- a/README.md
+++ b/README.md
@@ -7,10 +7,24 @@ you should configure the host for it in the provided 71-apt-cacher-ng file.
 
 ## Build
 
-To build the image do:
+To build the image without apt-cacher do:
 
 ```
-docker build -t kartoza/postgis git://github.com/timlinux/docker-postgis
+docker build -t kartoza/postgis:2.2 git://github.com/timlinux/docker-postgis
+```
+
+To build with apt-cache do you need to clone this repo locally first and 
+modify the contents of 71-apt-cacher-ng to match your cacher host. Then 
+build using a local url instead of directly from github.
+
+```
+git clone git://github.com/timlinux/docker-postgis
+```
+
+Now edit ``71-apt-cacher-ng`` then do:
+
+```
+docker build -t kartoza/postgis:2.2 .
 ```
 
 Run