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+++ b/middleware/prometheus/README.md
@@ -14,6 +14,9 @@ and a label `qtype` which old the query type.
The `response_rcode_count_total` has an extra label `rcode` which holds the rcode
of the response.
+If monitoring is enabled queries that do not enter the middleware chain are exported
+under the fake domain "dropped" (without a closing dot).
+
Restarting CoreDNS will stop the monitoring. This is a bug. Also [this upstream
Caddy bug](https://github.com/mholt/caddy/issues/675).