diff --git a/parsing/HebrewMorphologyCodes.html b/parsing/HebrewMorphologyCodes.html
index 0b14b1b..f9a18d4 100644
--- a/parsing/HebrewMorphologyCodes.html
+++ b/parsing/HebrewMorphologyCodes.html
@@ -180,12 +180,23 @@ <h3 id="p">Pronoun types</h3>
                         <tr><td>r</td><td>relative</td></tr>
                     </table>
                 </section>
-                <section>
-                    <h3 id="r">Preposition types</h3>
-                    <table>
-                        <tr><td>d</td><td>definite article</td></tr>
-                    </table>
-                </section>
+                <section>
+                    <h3 id="r">Preposition types</h3>
+                    <table>
+                        <tr><td>d</td><td>definite article</td></tr>
+                    </table>
+                    <p>The <code>d</code> preposition type marks an implicit
+                    definite article carried by the pointing of an inseparable
+                    preposition. The article is represented in the morphology,
+                    not as a separate token, because it has no consonantal form
+                    in the text. For example, in Gen.1.5:</p>
+<pre>    <span class="tag">&lt;w <span class="name">lemma=</span>"<span class="value">l/216</span>" <span class="name">morph=</span>"<span class="value">HRd/Ncbsa</span>"></span>לָ/אוֹר֙<span class="tag">&lt;/w></span></pre>
+                    <p>The <code>Rd</code> portion of the morphology indicates
+                    a preposition with an implicit definite article before
+                    <span lang="he">אוֹר</span>, while the token remains split
+                    only at the written morphemes as
+                    <span lang="he">לָ/אוֹר֙</span>.</p>
+                </section>
                 <section>
                     <h3 id="s">Suffix types</h3>
                     <table>
@@ -285,4 +296,4 @@ <h3>Beginner's Guide and FAQ</h3>
             </div>
         </article>
     </body>
-</html>
\ No newline at end of file
+</html>