diff --git a/docs/modules/ROOT/pages/how-tos/configuring/prefetching-dependencies.adoc b/docs/modules/ROOT/pages/how-tos/configuring/prefetching-dependencies.adoc
index 1d656a6c..8635b2e9 100644
--- a/docs/modules/ROOT/pages/how-tos/configuring/prefetching-dependencies.adoc
+++ b/docs/modules/ROOT/pages/how-tos/configuring/prefetching-dependencies.adoc
@@ -344,9 +344,11 @@ To prefetch dependencies for a component build, complete the following steps:
 packages: [nethack] <1>
 contentOrigin:
   repofiles: ["./fedora.repo"] <2>
+arches: [x86_64, aarch64] <3>
 ----
 <1> The `*packages*` list is the list of packages you want to install in your Container. You don't have to declare transitive dependencies here. The rpm-lockfile-prototype tool will resolve them for you.
 <2> This should be a reference to a repo file, like those found in `/etc/yum.repos.d/`. This tells the tooling where to find your rpm and its dependencies.
+<3> The `arches` array allows you to specify which architectures the dependencies should be downloaded for. If you're building a multi-arch container this array is mandatory, otherwise the build task will fail.
 
 . Copy any necessary yum/dnf repo files into your git repository. If you are using a fedora rawhide base image, that looks like: