Document HELM_VERSION

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
alexellis · Nov 10, 2019 · 428f437 · 428f437
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 ## Appendix
 
-* Currently there is an issue in k3s involving `iptables >= 1.8` that can affect the network communication. See the [k3s issue](https://github.com/rancher/k3s/issues/703) and the corresponding [kubernetes one](https://github.com/kubernetes/kubernetes/issues/71305) for more information and workarounds. The issue has been observed in Debian Buster but it can affect other distributions as well.
+### `iptables`
+
+> Note added by Eduardo Minguez Perez
+
+Currently there is an issue in k3s involving `iptables >= 1.8` that can affect the network communication. See the [k3s issue](https://github.com/rancher/k3s/issues/703) and the corresponding [kubernetes one](https://github.com/kubernetes/kubernetes/issues/71305) for more information and workarounds. The issue has been observed in Debian Buster but it can affect other distributions as well.
+
+### Custom helm versions
+
+Custom helm versions can be used with `k3sup app install`, if you set the environment variable `HELM_VERSION`