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-rw-r--r--images/README.md9
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diff --git a/images/README.md b/images/README.md
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@@ -59,3 +59,12 @@ project.
The continuous integration system can either take fine-grained dependencies on
individual `push` targets, or ensure all images are up-to-date with a single
`push-all-images` invocation.
+
+## Multi-Arch images
+
+By default, the image is built for host architecture. Cross-building can be
+achieved by specifying `ARCH` variable to make. For example:
+
+```
+$ make ARCH=aarch64 rebuild-default
+```