---
 libavcodec/avcodec.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index c863e53..840222c 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1190,6 +1190,9 @@ typedef struct AVCPBProperties {
  * @{
  */
 enum AVPacketSideDataType {
+    /* An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
+     * bytes worth of palette. Usually the decoder needs to track its content
+     * and set palette_has_changed on the output frame when updated. */
     AV_PKT_DATA_PALETTE,
 
     /**
-- 
2.10.0

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