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diff --git a/DOCS/man/en/vo.rst b/DOCS/man/en/vo.rst
index e3b8723966..dcfcb05278 100644
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@@ -430,6 +430,14 @@ opengl
dimension. Default is 128x256x64.
Sizes must be a power of two, and 256 at most.
+ alpha
+ Try to create a framebuffer with alpha component. This only makes sense
+ if the video contains alpha information (which is extremely rare). May
+ not be supported on all platforms. If alpha framebuffers are
+ unavailable, it silently falls back to a normal framebuffer. Note
+ that when using FBO indirections (such as with ``opengl-hq``), a FBO
+ format with alpha must be specified with the ``fbo-format`` option.
+
opengl-hq
Same as ``opengl``, but with default settings for high quality rendering.