diff --git a/profiles/index.html b/profiles/index.html
index b741a9636..1d65f1f72 100644
--- a/profiles/index.html
+++ b/profiles/index.html
@@ -126,6 +126,23 @@ <h3>Definitions</h3>
             The act of creating a profile  - an activity that has been undertaken by many communities with a range of formalisms.
           </p>
 				</dd>
+	<dt><dfn>specification</dfn></dt>
+        <dd>
+          <p></p>
+	</dd>
+	<dt><dfn>Base specification</dfn></dt>
+        <dd>
+          <p>A specification MAY assume a role of being a base specification, which is the foundation of the profile.
+          </p>
+	</dd>
+	<dt><dfn>Constraint</dfn></dt>
+        <dd>
+          <p></p>
+	</dd>
+	<dt><dfn>Data element</dfn></dt>
+        <dd>
+          <p></p>
+	</dd>
       </dl>
       <div class="issue" data-number="448"></div>
       <div class="issue" data-number="418"></div>