diff --git a/freeglut/web-src/docs/api.php b/freeglut/web-src/docs/api.php
index b8374da..7b1b99e 100644
--- a/freeglut/web-src/docs/api.php
+++ b/freeglut/web-src/docs/api.php
@@ -1711,7 +1711,8 @@ line of code a three-dimensional object which can be used to test a variety
 of OpenGL functionality.  None of the routines generates a display list
 for the object which it draws.  The functions generate normals appropriate
 for lighting but, except for the teapon functions, do not generate texture
-coordinates.
+coordinates. Depth testing (GL_LESS) should be enabled for the correct
+drawing of some of the objects.
 </p>
 
 <h2>15.1  glutWireSphere, glutSolidSphere</h2>