diff --git a/libavdevice/avdevice.h b/libavdevice/avdevice.h
index a6408ea4db1ad89088ca40eba5b59784a2f82583..3306020628c0047dbcc1908ca2de039ac1c7d926 100644
--- a/libavdevice/avdevice.h
+++ b/libavdevice/avdevice.h
@@ -119,8 +119,13 @@ enum AVDevToAppMessageType {
      * Device requests to create a window buffer. Exact meaning is device-
      * and application-dependent. Message is sent before rendering first
      * frame and all one-shot initializations should be done here.
+     * Application is allowed to ignore preferred window buffer size.
      *
-     * data: NULL.
+     * @note: Application is obligated to inform about window buffer size
+     *        with AV_APP_TO_DEV_WINDOW_SIZE message.
+     *
+     * data: AVDeviceRect: preferred size of the window buffer.
+     *       NULL: no preferred size of the window buffer.
      */
     AV_DEV_TO_APP_CREATE_WINDOW_BUFFER = MKBETAG('B','C','R','E'),
 
diff --git a/libavdevice/version.h b/libavdevice/version.h
index 956ed74643597bcf870817edf60c2e138a12b38f..55d7e93b3b263913e3cd2c2673599f4e0e8fa740 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -29,7 +29,7 @@
 
 #define LIBAVDEVICE_VERSION_MAJOR  55
 #define LIBAVDEVICE_VERSION_MINOR   9
-#define LIBAVDEVICE_VERSION_MICRO 100
+#define LIBAVDEVICE_VERSION_MICRO 101
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
                                                LIBAVDEVICE_VERSION_MINOR, \