diff --git a/spec/index.html b/spec/index.html
index 5a5887d9..26ab7ff8 100644
--- a/spec/index.html
+++ b/spec/index.html
@@ -7824,24 +7824,26 @@ <h5>TRIPLE</h5>
                   <span class="operator">&lt;&lt;(</span> subj pred obj <span class="operator">)&gt;&gt;</span>
             </pre>
             <p>
-              If the 3-tuple (<code style="color:black">subj</code>, 
+              Create a <a data-cite="RDF12-CONCEPTS#dfn-triple-term">triple term</a> from
+              <a data-cite="RDF12-CONCEPTS#dfn-rdf-term">RDF terms</a>
+              <code style="color:black">subj</code>, 
               <code style="color:black">pred</code>, 
-              <code style="color:black">obj</code>)
-              is an <a data-cite="RDF12-CONCEPTS#dfn-rdf-triple">RDF triple</a>
-              (that is, <code style="color:black">subj</code> is an
-              <a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a> or
-              <a data-cite="RDF12-CONCEPTS#dfn-blank-node">blank node</a>;
-              <code style="color:black">pred</code> is an
-              <a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>;
-              and <code style="color:black">obj</code> is an
-              <a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>,
-              <a data-cite="RDF12-CONCEPTS#dfn-triple-term">triple term</a>,
-              <a data-cite="RDF12-CONCEPTS#dfn-blank-node">blank node</a> or
-              <a data-cite="RDF12-CONCEPTS#dfn-literal">literal</a>)
-              the function returns a triple term with these three elements.
+              and <code style="color:black">obj</code>,
+              where the predicate is
+              <a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>.
               Otherwise, the function raises an error.
             </p>
-
+            <p class="note">
+              This allows triples to be 
+              <a data-cite="RDF12-CONCEPTS#dfn-symmetric-rdf-triple">symmetric RDF triples</a>
+              as corresponding to <a href="#sparqlTriplePatterns">SPARQL triple patterns</a>.
+              The graph result from a 
+              <a href="#constructGraph">CONSTRUCT</a> query form
+              allows <a data-cite="RDF12-CONCEPTS#dfn-rdf-triple">RDF triples</a>.
+              Any other 
+              <a data-cite="RDF12-CONCEPTS#dfn-symmetric-rdf-triple">symmetric RDF triples</a>
+              will be omitted from the result.
+            </p>
             <p>
               As a shorthand notation, the <code>TRIPLE</code> function 
               can also be written in the form of a