diff --git a/smpte/291.h b/smpte/291.h
index 686ed4e..fb66e44 100644
--- a/smpte/291.h
+++ b/smpte/291.h
@@ -91,14 +91,14 @@ extern "C"
 #define S291_SMPTEVBI_SDID          0x03
 
 /* SMPTE 299 */
-#define S291_24BITAUDIO_GROUP1_DID  0xe7
-#define S291_24BITAUDIO_GROUP2_DID  0xe6
-#define S291_24BITAUDIO_GROUP3_DID  0xe5
-#define S291_24BITAUDIO_GROUP4_DID  0xe4
-#define S291_24BITAUDIOCONTROL_GROUP1_DID  0xe3
-#define S291_24BITAUDIOCONTROL_GROUP2_DID  0xe2
-#define S291_24BITAUDIOCONTROL_GROUP3_DID  0xe1
-#define S291_24BITAUDIOCONTROL_GROUP4_DID  0xe0
+#define S291_HD_AUDIO_GROUP1_DID  0xe7
+#define S291_HD_AUDIO_GROUP2_DID  0xe6
+#define S291_HD_AUDIO_GROUP3_DID  0xe5
+#define S291_HD_AUDIO_GROUP4_DID  0xe4
+#define S291_HD_AUDIOCONTROL_GROUP1_DID  0xe3
+#define S291_HD_AUDIOCONTROL_GROUP2_DID  0xe2
+#define S291_HD_AUDIOCONTROL_GROUP3_DID  0xe1
+#define S291_HD_AUDIOCONTROL_GROUP4_DID  0xe0
 
 /* SMPTE 352 */
 #define S291_PAYLOADID_DID          0x41