diff --git a/resources/Documentation/Examples/RelevantRelations.txt b/resources/Documentation/Examples/RelevantRelations.txt
index 100c5f9a5a..e440917219 100644
--- a/resources/Documentation/Examples/RelevantRelations.txt
+++ b/resources/Documentation/Examples/RelevantRelations.txt
@@ -6,6 +6,8 @@ Suppose that we wanted authors to be able to indicate which relations should or
 
 Inform already knows about verbs for describing supporting, containment, carrying, and wearing, so we could write a set of instructions to handle such cases. To do this, we're using the "writing a paragraph about" activity, which is described in the chapter on activities.
 
+The following uses what is, strictly speaking, a piece of internal machinery not really intended for public use: a variable called "prior named object" which keeps track of what noun other words should agree with. It is not safe to use this variable except to clear it: "now the prior named object is nothing". In a few situations, this prevents glitches in adaptive text.
+
 	{*}"Relevant Relations"
 	
 	Section 1 - Procedure