Update wireguard-s2s.rst (#185)

source/manual/how-tos/wireguard-s2s.rst

@@ -33,8 +33,10 @@ key and give it to the other side.
 
 When this VPN is set up on OPNsense only do the same on the second machine and exchange the public
 keys. Now go to tab **Endpoints** and add the remote site, give it a **Name**, insert the **Public
-Key** and the **Allowed IPs** (e.g. 192.168.0.2/24, 10.10.10.0/24). **Endpoint Address** is the public IP of the
-remote site and you can also set optionally the **Endpoint Port**, now hit **Save changes**.
+Key** and the **Allowed IPs** e.g. *192.168.0.2/32, 10.10.10.0/24*. This will set the remonte tunnel
+IP address (/32 is important when using multiple endpoints) and route 10.10.10.0/24 via the tunnel. 
+**Endpoint Address** is the public IP of the remote site and you can also set optionally the 
+**Endpoint Port**, now hit **Save changes**.
 
 Go back to tab **Local**, open the instance and choose the newly created endpoint in **Peers**.