diff --git a/matrix/m.policy.rule.server/README.md b/matrix/m.policy.rule.server/README.md
index ca4b4ae..3fab3b4 100644
--- a/matrix/m.policy.rule.server/README.md
+++ b/matrix/m.policy.rule.server/README.md
@@ -22,6 +22,8 @@ TL;DR
 
 ## Allowing all servers
 
+**_WARNING! This is poorly supported and [operations such as unban may unexpectedly remove this rule!](https://github.com/the-draupnir-project/Draupnir/issues/56)_**
+
 - Event type: `m.policy.rule.server`
 - State key: `*`