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diff --git a/doc/filters.texi b/doc/filters.texi
index d5aa99be8e..b995d757d8 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2864,6 +2864,10 @@ The time base used for input timestamps.
@item sar
The sample (pixel) aspect ratio of the input video.
+@item hw_frames_ctx
+When using a hardware pixel format, this should be a reference to an
+AVHWFramesContext describing input frames.
+
@end table
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