Index: trunk/doc/user/06_feature/query/lang.html
===================================================================
--- trunk/doc/user/06_feature/query/lang.html	(revision 32028)
+++ trunk/doc/user/06_feature/query/lang.html	(revision 32029)
@@ -23,6 +23,10 @@
 <p>
 A simpler variant of a rule is a single expression, without any <i>rule</i> or
 <i>let</i> or <i>assert</i> keywords in it.
+<p>
+Various parts of pcb-rnd, including the <i>advanced search feature</i> and
+the <i>query()</i> action, runs a DRC rule (typically the simplified,
+single-expression variant) to find/select/list drawing objects.
 
 <h3 autotoc="yes"> Variables (lists) </h3>
 <p>