diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 75f4fe938b..32564a8e93 100644
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -3842,6 +3842,11 @@ system.
    is sent to that domain, it is recreated with the counters set
    to zero.)
 
+   .. note::
+
+       Fetches generated automatically in the result of :any:`prefetch` are
+       exempt from this quota.
+
 .. namedconf:statement:: fetches-per-server
    :tags: server, query
    :short: Sets the maximum number of simultaneous iterative queries allowed to be sent by a server to an upstream name server before the server blocks additional queries.
@@ -3873,6 +3878,11 @@ system.
    increased. The :any:`fetch-quota-params` options can be used to adjust
    the parameters for this calculation.
 
+   .. note::
+
+       Fetches generated automatically in the result of :any:`prefetch` are
+       exempt from this quota, but they are included in the quota calculations.
+
 .. namedconf:statement:: fetch-quota-params
    :tags: server, query
    :short: Sets the parameters for dynamic resizing of the :any:`fetches-per-server` quota in response to detected congestion.