---
 doc/APIchanges      | 4 ++++
 libavutil/frame.h   | 4 ++++
 libavutil/version.h | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/APIchanges b/doc/APIchanges
index 293b2a4..10fc476 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,10 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2013-11-xx - xxxxxxx - lavu 52.21.0 - frame.h
+  Add AV_FRAME_DATA_MATRIXENCODING value to the AVFrameSideDataType enum, which
+  identifies AVMatrixEncoding data.
+
 2013-11-xx - xxxxxxx - lavu 52.20.0 - channel_layout.h
   Add values for various Dolby flags to the AVMatrixEncoding enum.
 
diff --git a/libavutil/frame.h b/libavutil/frame.h
index d869d83..2e00adc 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -41,6 +41,10 @@ enum AVFrameSideDataType {
      * The number of bytes of CC data is AVFrameSideData.size.
      */
     AV_FRAME_DATA_A53_CC,
+    /**
+     * The data is the AVMatrixEncoding enum defined in libavutil.
+     */
+    AV_FRAME_DATA_MATRIXENCODING,
 };
 
 typedef struct AVFrameSideData {
diff --git a/libavutil/version.h b/libavutil/version.h
index dad8e2f..36c89d8 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -37,7 +37,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 52
-#define LIBAVUTIL_VERSION_MINOR 20
+#define LIBAVUTIL_VERSION_MINOR 21
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
-- 
1.8.3.4 (Apple Git-47)

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