--- a/spec/latest/json-ld-api/index.html	Thu Apr 19 11:06:05 2012 -0700
+++ b/spec/latest/json-ld-api/index.html	Thu Apr 19 11:23:23 2012 -0700
@@ -1559,8 +1559,20 @@
 
 <p class="note">Just a sketch for now</p>
 <ol class="algorithm">
-  <li>Validate <strong>expanded frame</strong>.</li>
-  <li>Create a set of matched subjects by filtering <em>subjects</em>.</li>
+  <li>Validate <em>frame</em>.</li>
+  <li>Create a set of matched subjects by filtering <em>subjects</em> by checking
+    the <tref>map of flattened subjects</tref> against <em>frame</em>:
+    <ol class="algorithm">
+      <li>If <em>frame</em> has a <code>@type<code> property containing
+        one or more <tref title="iri">IRIs</tref> match any <tref>subject definition</tref>
+        with a <code>@type</code> property including any of those <tref title="iri">IRIs</tref>.</li>
+      <li>Otherwise, if <em>frame</em> has a <code>@type<code> property only
+        a empty <tref>JSON object</tref>, matches any <tref>subject definition</tref>
+        with a <code>@type</code> property, regardless of the actual values.</li>
+      <li>Otherwise, match if the <tref>subject definition</tref> contains all of the
+        non-<tref>keyword</tref> properties in <em>frame</em>.</li>
+    </ol>
+  </li>
   <li>Get values for <em>embedOn</em> and <em>explicitOn</em> by looking in <em>frame</em>
     for the keys <code>@embed</code> and <code>@explicit</code> using the current values
     for <tref>object embed flag</tref> and <tref>explicit inclusion flag</tref> from <em>state</em> if not found.</li>