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@@ -513,6 +513,34 @@ This function allows for 3D object "picking."
 "pick line" (the line from the camera through the "pick point" on the
 screen.
 Upon error, <tt>pickObjects</tt> returns <tt>nil</tt>.
+For each object in the "pick line", the following properties are set:
+<ul>
+    <li><tt>pick_dist</tt> - the distance to the object along the pick line</li>
+    <li><tt>pick_pos</tt> - the 3D coordinates of the pick point</li>
+    <li><tt>pick_normal</tt> - the normal of the object at the pick point</li>
+</ul>
+</p>
+
+<a name="ag_pickOne" />
+<h3>pickOne</h3>
+<p><tt>objects = ag.pickOne(x, y, obj)</tt></p>
+<p>
+This function allows for 3D object "picking," but only tests the given
+object for intersection with the pick line and is thus much more efficient
+than <a href="#ag_pickObjects">pickObjects()</a> if you only care about
+selecting on a given object.
+<tt>x</tt> and <tt>y</tt> should be the 2D screen coordinates of the
+"pick point."
+<tt>obj</tt> indicates which object to be tested.
+<tt>pickOne</tt> returns a boolean for whether or not the given object
+was hit by the "pick line."
+If the return value is <tt>true</tt>, then the following properties are
+set on <tt>obj</tt>:
+<ul>
+    <li><tt>pick_dist</tt> - the distance to the object along the pick line</li>
+    <li><tt>pick_pos</tt> - the 3D coordinates of the pick point</li>
+    <li><tt>pick_normal</tt> - the normal of the object at the pick point</li>
+</ul>
 </p>
 
 <a name="ag_print" />