Merge pull request #184 from AdguardTeam/Connection-doesn't-work-when…

…-using-only-IPv6-as-preferred-IP-version

clarified info about the Preferred IP version option
#342

docs/adguard-vpn-for-android/overview.md

@@ -113,9 +113,9 @@ In this section, you can also export logs and system info to share them with sup
 
 The last section of *Advanced settings* is *Low-level settings*. We urge you not to enter this section unless you are highly qualified or have been asked to do so by our support team. Here it is possible to enable TUN interface logging or IPv6 protocol on the VPN interface, choose a proxy server port or Internet protocol version that should be used.
 
-:::note Compatibility
+:::caution
 
-The *Enable IPv6* option is only available for networks that support IPv6.
+In the **Preferred IP version** option, before you choose between IPv6 and IPv4, make sure that your network supports that protocol. For example, if you select IPv6 and your network only supports IPv4, you will have problems connecting to the Internet. And vice versa.
 
 :::