diff --git a/display/graphic/common/v2_0/BufferHandleMetaKeyType.idl b/display/graphic/common/v2_0/BufferHandleMetaKeyType.idl
index b698b540fb6749dd096794dc4b9f33c767e10e5b..ba69f35d371a4d4911d38778e3a0368b52124dbf 100644
--- a/display/graphic/common/v2_0/BufferHandleMetaKeyType.idl
+++ b/display/graphic/common/v2_0/BufferHandleMetaKeyType.idl
@@ -54,6 +54,7 @@ enum BufferHandleAttrKey {
     /* temporarily extended meta type, between system and vendor */
     ATTRKEY_OEM_EXT_START = 4096,
     ATTRKEY_EXTERNAL_METADATA_001 = 4097, // value: ExternalMetadata001
+    ATTRKEY_EXTERNAL_METADATA_002 = 4098, // value: SDR nature tone metadata
     ATTRKEY_END = 8192
 };