Add warning about Proton VPN killswitch Intel Macs (#1780)

Add warning about Proton VPN killswitch Intel Macs (#1780)

Signed-off-by: Daniel Gray <dngray@privacyguides.org>
diff --git a/docs/vpn.en.md b/docs/vpn.en.md
index b3c1912..6207582 100644
--- a/docs/vpn.en.md
+++ b/docs/vpn.en.md
@@ -86,6 +86,10 @@ Find a no-logging VPN operator who isn’t out to sell or read your web traffic.
 
     Proton VPN clients support two factor authentication on all platforms except Linux at the moment. Proton VPN has their own servers and datacenters in Switzerland, Iceland and Sweden. They offer adblocking and known malware domains blocking with their DNS service. Additionally, Proton VPN also offers "Tor" servers allowing you to easily connect to onion sites, but we still strongly recommend using [the official Tor Browser](https://www.torproject.org/) for this purpose.
 
+!!! danger "Killswitch feature is broken on Intel-based Macs"
+
+    System crashes [may occur](https://protonvpn.com/support/macos-t2-chip-kill-switch/) on Intel-based Macs when using the VPN killswitch. If you require this feature, and you are using a Mac with Intel chipset, you should consider using another VPN service.
+
 ### IVPN
 
 !!! recommendation

GitHub
sha: c113f0326483c4722a77dbfd1ddbd52fb26ee221