diff --git a/doc/md/docker/shaarli-images.md b/doc/md/docker/shaarli-images.md
index e673477..123da83 100644
--- a/doc/md/docker/shaarli-images.md
+++ b/doc/md/docker/shaarli-images.md
@@ -24,7 +24,7 @@ The `stable` image relies on:
 - [PHP5-FPM](http://php-fpm.org/)
 - [Nginx](http://nginx.org/)
 
-Additional [Dockerfiles](https://github.com/shaarli/Shaarli/tree/doc-docker-arm/docker) are provided for the `arm32v7` platform, relying on [Linuxserver.io Alpine armhf images](https://hub.docker.com/r/lsiobase/alpine.armhf/).
+Additional [Dockerfiles](https://github.com/shaarli/Shaarli/tree/doc-docker-arm/docker) are provided for the `arm32v7` platform, relying on [Linuxserver.io Alpine armhf images](https://hub.docker.com/r/lsiobase/alpine.armhf/). These images must be built using [`docker build`](https://docs.docker.com/engine/reference/commandline/build/) on an `arm32v7` machine or using an emulator such as [qemu](https://resin.io/blog/building-arm-containers-on-any-x86-machine-even-dockerhub/).
 
 ### Download from DockerHub
 ```bash