diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index cfa4cfd..50a378f 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -127,6 +127,7 @@
 
 enum media_set_parameter_keys {
     KEY_PARAMETER_TIMED_TEXT_TRACK_INDEX = 1000,
+    KEY_PARAMETER_TIMED_TEXT_ADD_OUT_OF_BAND_SOURCE = 1001,
 };
 // ----------------------------------------------------------------------------
 // ref-counted object for callbacks