diff --git a/spec/index.html b/spec/index.html
index 03e64f9..c2e165c 100644
--- a/spec/index.html
+++ b/spec/index.html
@@ -147,9 +147,9 @@ <h3>Graph-based Data Model</h3>
     <figure id="fig-rdf-graph">
       <a href="rdf-graph.svg">
         <object data="rdf-graph.svg"
-          aria-label="An RDF graph with two nodes (Subject and Object) and a triple connecting them (Predicate)"></object>
+          aria-label="An RDF graph with two nodes (Subject and Object) and an arc (Predicate) connecting them"></object>
       </a>
-      <figcaption>An RDF graph with two nodes (Subject and Object) and a triple connecting them (Predicate)</figcaption>
+      <figcaption>An RDF graph with two nodes (Subject and Object) and an arc (Predicate) connecting them</figcaption>
     </figure>
 
     <p>There can be four kinds of <a>nodes</a> in an