diff --git a/docs/settings.rst b/docs/settings.rst
index 5acfc0c4b964c..4e36fa7718df5 100644
--- a/docs/settings.rst
+++ b/docs/settings.rst
@@ -1541,6 +1541,8 @@ Number of receiver (listening) threads to start. See :doc:`performance`.
 
 Recursive DNS server to use for ALIAS lookups and the internal stub resolver. Only one address can be given.
 
+It is assumed that the network path to the recursive DNS server, and the recursive DNS server itself is trusted.
+
 Examples::
 
   resolver=127.0.0.1