usingcurl/proxies/socks.md: clarify name resolving

Closes #352

usingcurl/proxies/socks.md

@@ -7,14 +7,13 @@ You can select the specific SOCKS version to use by using the correct scheme
 part for the given proxy host with `-x`, or you can specify it with a separate
 option instead of `-x`.
 
-SOCKS4 is for the version 4 and SOCKS4a is for the version 4 without resolving
-the host name locally:
+SOCKS4 is for the version 4 but curl resolves the name:
 
     curl -x socks4://proxy.example.com http://www.example.com/
 
     curl --socks4 proxy.example.com http://www.example.com/
 
-The SOCKS4a versions:
+SOCKS4a is for the version 4 with resolving done by the proxy:
 
     curl -x socks4a://proxy.example.com http://www.example.com/
 
@@ -27,9 +26,19 @@ resolving the host name locally:
 
     curl --socks5 proxy.example.com http://www.example.com/
 
-The SOCKS5-hostname versions. This sends the host name to the server so
-there is no name resolving done locally:
+The SOCKS5-hostname versions. This sends the host name to the proxy so there
+is no name resolving done by curl locally:
 
     curl -x socks5h://proxy.example.com http://www.example.com/
 
     curl --socks5-hostname proxy.example.com http://www.example.com/
+
+Helpful table to figure how which side that resolves the name for which socks
+version:
+
+| SOCKS | who resolves the name | works with IPv6 |
+|-------|-----------------------|-----------------|
+| 4     | curl                  | no              |
+| 4a    | proxy                 | no              |
+| 5     | curl                  | yes             |
+| 5h    | proxy                 | yes             |