diff --git a/docs/curl.1 b/docs/curl.1
index 8197e81..ca876be 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -1170,6 +1170,8 @@ mutually exclusive.
 If this option is used several times, the last one will be used. (This option
 was previously wrongly documented and used as --socks without the number
 appended.)
+
+This option (as well as \fI--socks4\fP) does not work with IPV6, FTPS or LDAP.
 .IP "--socks5-gssapi-service <servicename>"
 The default service name for a socks server is rcmd/server-fqdn. This option
 allows you to change it.