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@@ -53,6 +53,8 @@
 <dt><span class="glossterm"><a name="annotation-glossterm-nullable"></a>nullable</span></dt>
 <dd class="glossdef"><p>NULL may be passed as the value in, out, in-out; or as a return value.</p></dd>
 <a name="glsO"></a><h3 class="title">O</h3>
+<dt><span class="glossterm"><a name="annotation-glossterm-optional"></a>optional</span></dt>
+<dd class="glossdef"><p>NULL may be passed instead of a pointer to a location.</p></dd>
 <dt><span class="glossterm"><a name="annotation-glossterm-out"></a>out</span></dt>
 <dd class="glossdef"><p>Parameter for returning results. Default is <acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>.</p></dd>
 <a name="glsS"></a><h3 class="title">S</h3>