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diff --git a/doc/filters.texi b/doc/filters.texi
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--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -13457,6 +13457,10 @@ The sample (pixel) aspect ratio of the input video.
Specify the optional parameters to be used for the scale filter which
is automatically inserted when an input change is detected in the
input size or format.
+
+@item hw_frames_ctx
+When using a hardware pixel format, this should be a reference to an
+AVHWFramesContext describing input frames.
@end table
For example: