diff --git a/doc/index.html b/doc/index.html
index 022c1d3..5da9b9c 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -955,6 +955,19 @@ Hence a scale of 4 would appear to shrink the texture by a factor of
 4 and tile the texture 16 times where it normally would have once.
 </p>
 
+<a name="object_setTransparency" />
+<h3>setTransparency</h3>
+<p><tt>obj:setTransparency(t)</tt></p>
+<p>
+This function sets the transparency of the object.
+<tt>t</tt> should be between 0.0 and 1.0, with 1.0 being fully transparent.
+Note that the object will only render transparent if it is created with
+the optional ''enable_blending'' attribute set to ''true.''
+This does incur a slight performance hit.
+This call has no effect when the object has a texture specified, as the
+transparency is taken from the texture in that case.
+</p>
+
 <a name="object_setVisible" />
 <h3>setVisible</h3>
 <p><tt>obj:setVisible(visible_flag)</tt></p>