diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index c95a449417..ef6c1c7659 100644
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -5492,7 +5492,9 @@ Response Rate Limiting
 
       All non-empty responses for a valid domain name (qname) and record type
       (qtype) are identical and have a limit specified with
-      :any:`responses-per-second` (default 0 or no limit).
+      :any:`responses-per-second` (default 0 or no limit). All valid wildcard
+      domain names are interpreted as the zone's origin name concatenated to the
+      "*" name.
 
    .. namedconf:statement:: nodata-per-second
       :tags: query