diff --git a/builds/any/rootfs/jessie/standard/standard.yml b/builds/any/rootfs/jessie/standard/standard.yml
index fad73bd8..b7aa4067 100644
--- a/builds/any/rootfs/jessie/standard/standard.yml
+++ b/builds/any/rootfs/jessie/standard/standard.yml
@@ -42,7 +42,7 @@ Multistrap:
 
   ONL:
     packages: *Packages
-    source: http://apt.opennetlinux.org/debian
+    source: http://${APT_CACHE}apt.opennetlinux.org/debian
     suite: unstable
     omitdebsrc: true
 
diff --git a/builds/any/rootfs/stretch/standard/standard.yml b/builds/any/rootfs/stretch/standard/standard.yml
index 48969cbe..b57fe6c7 100644
--- a/builds/any/rootfs/stretch/standard/standard.yml
+++ b/builds/any/rootfs/stretch/standard/standard.yml
@@ -42,7 +42,7 @@ Multistrap:
 
   ONL:
     packages: *Packages
-    source: http://apt.opennetlinux.org/debian
+    source: http://${APT_CACHE}apt.opennetlinux.org/debian
     suite: unstable
     omitdebsrc: true
 
diff --git a/builds/any/rootfs/wheezy/standard/standard.yml b/builds/any/rootfs/wheezy/standard/standard.yml
index 083fb7a9..22530fb0 100644
--- a/builds/any/rootfs/wheezy/standard/standard.yml
+++ b/builds/any/rootfs/wheezy/standard/standard.yml
@@ -42,7 +42,7 @@ Multistrap:
 
   ONL:
     packages: *Packages
-    source: http://apt.opennetlinux.org/debian
+    source: http://${APT_CACHE}apt.opennetlinux.org/debian
     suite: unstable
     omitdebsrc: true
 
diff --git a/docs/README-proxy.md b/docs/README-proxy.md
new file mode 100644
index 00000000..4a1a7e55
--- /dev/null
+++ b/docs/README-proxy.md
@@ -0,0 +1,24 @@
+# How to build ONL behind an HTTP Proxy
+
+Many corporate environments don't provide native access to the Internet
+and instead all access must go through an HTTP proxy.  Since the ONL
+build process dynamically pulls lots of things, this can be a pain.
+While everyone's setup is different, hopefully these directions help
+reduce that pain.
+
+* Make sure you have apt-cacher-ng installed in your host (non-docker)
+    environment and that docker starts it.  Next, configure it to use
+    your proxy:
+
+      $ grep Proxy /etc/apt-cacher-ng/acng.conf
+      Proxy: http://myproxy.mycompany.com:8080
+      $ sudo /etc/init.d/apt-cacher-ng restart
+
+* Make sure your git config is configured correctly for 
+    proxies:
+
+      $ cat ~/.gitconfig
+      [https]
+           proxy = myproxy.mycompany.com:8080
+      [https]
+           proxy = myproxy.mycompany.com:8080