diff --git a/README.md b/README.md
index 66e3a9c..4c9fc56 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,13 @@ This code is mostly unmaintained and uses several old javascript libraries.
 
 ### Setup:
 
+The following domain setup is required, for the IPv4/IPv6 tests to work:
+- The domains can be changed in `include/config.php`
+- `A` record for v4.ip.zuim.de and no `AAAA` record, so only IPv4 is possible for this domain
+- `AAAA` record for v6.ip.zuim.de and no `A` record, so only IPv6 is possible for this domain
+- `A` and `AAAA` record for ip.zuim.de as the main entry point
+- Set up your webserver, so direct ip access and all of these domains resolve to the project directory.
+
 To get the geoip data, the geoip2 module for nginx is used with the following configuration:
 ```
 geoip2 /var/lib/GeoIP/GeoLite2-City.mmdb {
@@ -32,4 +39,4 @@ Download these files directly and add them in the main folder:
 - https://ip.zuim.de/1MB.zip
 - https://ip.zuim.de/10MB.zip
 - https://ip.zuim.de/100MB.zip
-- https://ip.zuim.de/img.jpg?t=1721317515702
+- https://ip.zuim.de/img.jpg