Based on the one for av_opt_set_dict_val().

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavutil/opt.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavutil/opt.h b/libavutil/opt.h
index 2d76ec6105..1b30a32317 100644
--- a/libavutil/opt.h
+++ b/libavutil/opt.h
@@ -797,6 +797,10 @@ int av_opt_set_image_size(void *obj, const char *name, int 
w, int h, int search_
 int av_opt_set_pixel_fmt (void *obj, const char *name, enum AVPixelFormat fmt, 
int search_flags);
 int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat 
fmt, int search_flags);
 int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int 
search_flags);
+/**
+ * @note Any old chlayout present is discarded and replaced with a copy of the 
new one. The
+ * caller still owns layout is and responsible for uninitializing it.
+ */
 int av_opt_set_chlayout(void *obj, const char *name, const AVChannelLayout 
*layout, int search_flags);
 /**
  * @note Any old dictionary present is discarded and replaced with a copy of 
the new one. The
-- 
2.45.0

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