diff --git a/apache/Dockerfile b/apache/Dockerfile
index 4cd4c47..8a4b7d8 100644
--- a/apache/Dockerfile
+++ b/apache/Dockerfile
@@ -1,8 +1,9 @@
-FROM ubuntu:bionic
+ARG FROM=docker.io/ubuntu:bionic
+FROM ${FROM}
 
 LABEL org.opencontainers.image.authors='airship-discuss@lists.airshipit.org, irc://#airshipit@freenode' \
       org.opencontainers.image.url='https://airshipit.org' \
-      org.opencontainers.image.documentation='https://airship-images.readthedocs.org' \
+      org.opencontainers.image.documentation='https://airshipit.readthedocs.io' \
       org.opencontainers.image.source='https://opendev.org/airship/images' \
       org.opencontainers.image.vendor='The Airship Authors' \
       org.opencontainers.image.licenses='Apache-2.0'