diff --git a/admin_manual/configuration_server/reverse_proxy_configuration.rst b/admin_manual/configuration_server/reverse_proxy_configuration.rst
index 531a9885a..2ba1bbc4c 100644
--- a/admin_manual/configuration_server/reverse_proxy_configuration.rst
+++ b/admin_manual/configuration_server/reverse_proxy_configuration.rst
@@ -26,6 +26,9 @@ to define the servers Nextcloud should trust as proxies. This parameter
 provides protection against client spoofing, and you should secure those
 servers as you would your Nextcloud server.
 
+.. note:: CIDR notation for IPv6 is currently work in progress and thus not
+available as of yet.
+
 A reverse proxy can define HTTP headers with the original client IP address,
 and Nextcloud can use those headers to retrieve that IP address. Nextcloud uses
 the de-facto standard header 'X-Forwarded-For' by default, but this can be