diff --git a/docs/fbdev-dri.html b/docs/fbdev-dri.html
index df33738d910..15467019c41 100644
--- a/docs/fbdev-dri.html
+++ b/docs/fbdev-dri.html
@@ -211,6 +211,12 @@ to the MiniGLX API can also be run on full Xlib/GLX implementations.
 This allows some degree of flexibility for software development and testing.
 </p>
 
+<p>
+However, the MiniGLX API is not binary-compatible with full Xlib/GLX.
+Some of the structures are different and some macros/functions work
+differently.
+See the <code>GL/miniglx.h</code> header file for details.
+</p>
 
 
 </body>