diff --git a/readme.md b/readme.md
index f2ab5fe..0657d0e 100644
--- a/readme.md
+++ b/readme.md
@@ -18,4 +18,4 @@ It's hostname is ``fsn1-2.forsaken-ashbirds.net``.
 - If you want to volunteer additional runner capacity to the entire instance, feel free to get in touch.
 - Provided runners may not be available 24/7 but should be online most of the day.
 - IPv4 connectivity for HTTP connections is available through a proxy service.
-  Use it by specifying ``HTTP_PROXY=http://fsn1-1.forsaken-ashbirds.net:8888`` and ``HTTPS_PROXY=http://fsn1-1.forsaken-ashbirds.net:8888`` where required. (The service is not reachable from outside the runner.)
+  Use it by specifying ``HTTP_PROXY=http://6.fsn1-1.forsaken-ashbirds.net:8888`` and ``HTTPS_PROXY=http://6.fsn1-1.forsaken-ashbirds.net:8888`` where required. (The service is not reachable from outside the runner. The IPv6-only hostname must be used so that the process doesn't try connecting to the proxy by IPv4.)