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diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index 2334535998..82a52b0297 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -295,7 +295,20 @@ Available video output drivers are:
``rgb16f``, ``rgb32f`` or ``rgb``. Known problems include Mesa/Intel not
accepting ``rgb16``, Mesa sometimes not being compiled with float texture
support, and some OS X setups being very slow with ``rgb16`` but fast
- with ``rgb32f``.
+ with ``rgb32f``. If you have problems, you can also try passing the
+ ``dumb-mode=yes`` sub-option.
+
+ ``dumb-mode=<yes|no>``
+ This mode is extremely restricted, and will disable most extended
+ OpenGL features. This includes high quality scalers and custom
+ shaders!
+
+ It is intended for hardware that does not support FBOs (including GLES,
+ which supports it insufficiently), or to get some more performance out
+ of bad or old hardware.
+
+ This mode is forced automatically if needed, and this option is mostly
+ useful for debugging.
``scale=<filter>``