diff --git a/md/clause-9.md b/md/clause-9.md
index bdf92df2aa43f601fa8b070c65f0361b15c74b75..6a69679b13e9070b4b42a8bffdac3ad9e82c52e7 100644
--- a/md/clause-9.md
+++ b/md/clause-9.md
@@ -821,10 +821,14 @@ Furthermore, it is not known if any distributed endpoints of a registered
 [Context Source]{.HTML-Keyboard} are in turn reliant on previously encountered
 [Context Sources]{.HTML-Keyboard} thus causing an infinite loop. Therefore, when
 processing a distributed operation, a specific field listing all previously
-encountered [Context Sources]{.HTML-Keyboard} (e.g. a Via header in the response
-in case of HTTP binding (IETF RFC 7230 [n.12])) shall be passed as part of the
-request and this field can be used to exclude duplicated sources from matching
-as [Context Source Registration]{.HTML-Keyboard}.
+encountered [Context Sources]{.HTML-Keyboard} (e.g. a [Via]{.HTML-Code} header 
+in the response in case of HTTP binding (IETF RFC 7230 [n.12])) shall be passed
+as part of the request and this field can be used to exclude duplicated sources 
+from matching as [Context Source Registration]{.HTML-Keyboard}. If the requested 
+endpoint is also listed as **previously encountered** when a
+[Context Source]{.HTML-Keyboard} receives a call to that endpoint, this is an
+indication that a new loop has been detected. A suitable error shall be returned,
+indicating that the loop has been detected.
 
 In the case of multi-tenancy (see Clause+++clause-7+++7.8) each
 [Tenant]{.HTML-Keyboard} found within each registered [Context