diff --git a/include/libmkv.h b/include/libmkv.h

index 146a91f..f03d608 100644

--- a/include/libmkv.h

+++ b/include/libmkv.h

@@ -94,6 +94,7 @@ extern "C" {

 #define MK_SUBTITLE_USF    "S_TEXT/USF"

 #define MK_SUBTITLE_VOBSUB "S_VOBSUB"

 #define MK_SUBTITLE_BMP    "S_IMAGE/BMP"

+#define MK_SUBTITLE_PGS    "S_HDMV/PGS"

 /* Official Tags */

 #define MK_TAG_TITLE		"TITLE"