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diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
index 0ff68cd8cf62..73cd99828010 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
@@ -258,6 +258,23 @@ please make a proposal on the linux-media mailing list.
and it is used by various multimedia hardware blocks like GPU, display
controllers, ISP and video accelerators.
It contains four planes for progressive video.
+ * .. _V4L2-PIX-FMT-AJPG:
+
+ - ``V4L2_PIX_FMT_AJPG``
+ - 'AJPG'
+ - ASPEED JPEG format used by the aspeed-video driver on Aspeed platforms,
+ which is generally adapted for remote KVM.
+ On each frame compression, I will compare the new frame with previous
+ one to decide which macroblock's data is changed, and only the changed
+ macroblocks will be compressed.
+
+ The implementation is based on AST2600 A3 datasheet, revision 0.9, which
+ is not publicly available. Or you can reference Video stream data format
+ – ASPEED mode compression of SDK_User_Guide which available on
+ AspeedTech-BMC/openbmc/releases.
+
+ Decoder's implementation can be found here,
+ `aspeed_codec <https://github.com/AspeedTech-BMC/aspeed_codec/>`__
.. raw:: latex
\normalsize