diff --git a/README.md b/README.md
index 4e0039c..14b28fd 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,5 @@ The _ecal_ Dockerfile uses the following ARGs (--build-arg):
 - *OS*: Used as the second part of the version to pull the _ecal-base_ image, e.g. _bionic_.
 - *ARCH*: Used as the third part of the version to pull the _ecal-base_ image, e.g. _arm_.
 - *TAG*: The eCAL repository tag to check out, e.g. _v5.7.1_.
+
+The _ecal-base-archlinux_ container may be used if you want to build eCAL yourself locally within an Arch Linux environment. The _ecal_base-archlinux-aur_ container pulls in the [AUR package](https://aur.archlinux.org/packages/ecal/) and is meant as a clean build environment for pushing new AUR package versions.