added note about double buffering for in-window rendering

diff --git a/docs/README.3DFX b/docs/README.3DFX
index f726301b22c99b38e57a065bb064c639373172d9..aa6b9ef31ac6310ced250097a7fcfbaeadb66b5e 100644 (file)
--- a/docs/README.3DFX
+++ b/docs/README.3DFX
@@ -205,6 +205,9 @@ Doing more with Mesa & Linux Glide:
        visual depth doesn't match the Voodoo framebufffer bit per pixel, it
        is required also a pixel format translation).
 
+       NOTE: the in-window rendering feature only works with double-buffering.
+
+
         On the fly switching between in window rendering and full screen rendering
        --------------------------------------------------------------------------