update package build doc to include arm specific steps

Bug: 199537750
Test: inspect rendered document
Change-Id: Id5888511f7b1f167a4b8df0df7220853311b38c1

1 files changed, 12 insertions, 2 deletions

diff --git a/README.md b/README.md
index 222089801..7ef8d6234 100644
--- a/README.md
+++ b/README.md
@@ -12,15 +12,25 @@
    take cloud-vendor-specific steps to enable. For Google Compute Engine
    specifically, see the [GCE guide].
 
-   [GCE guide]: https://cloud.google.com/compute/docs/instances/enable-nested-virtualization-vm-instances
+  [GCE guide]: https://cloud.google.com/compute/docs/instances/enable-nested-virtualization-vm-instances
 
-2. Download, build, and install the host debian package:
+*** promo
+   ARM specific steps:
+   - When running on an ARM machine, the most direct way is to check
+   for the existence of `/dev/kvm`. Note that this method can also be used to
+   confirm support of KVM on any environment.
+   - Before proceeding to the next step, please first follow
+   [the guide](multiarch-howto.md) to adjust APT sources.
+***
+
+ 2. Download, build, and install the host debian package:
 
    ```bash
    git clone https://github.com/google/android-cuttlefish
    cd android-cuttlefish
    debuild -i -us -uc -b
    sudo dpkg -i ../cuttlefish-common_*_amd64.deb || sudo apt-get install -f
+   sudo usermod -aG kvm,cvdnetwork $USER
    sudo reboot
    ```