diff --git a/codec/common/inc/wels_common_defs.h b/codec/common/inc/wels_common_defs.h
index cb2aa809..e94c5398 100644
--- a/codec/common/inc/wels_common_defs.h
+++ b/codec/common/inc/wels_common_defs.h
@@ -97,12 +97,12 @@ enum EWelsNalUnitType {
   NAL_UNIT_SPS_EXT              = 13,
   NAL_UNIT_PREFIX               = 14,
   NAL_UNIT_SUBSET_SPS           = 15,
-  NAL_UNIT_RESV_16              = 16,
+  NAL_UNIT_DEPTH_PARAM          = 16, // NAL_UNIT_RESV_16
   NAL_UNIT_RESV_17              = 17,
   NAL_UNIT_RESV_18              = 18,
   NAL_UNIT_AUX_CODED_SLICE      = 19,
   NAL_UNIT_CODED_SLICE_EXT      = 20,
-  NAL_UNIT_RESV_21              = 21,
+  NAL_UNIT_MVC_SLICE_EXT        = 21, // NAL_UNIT_RESV_21
   NAL_UNIT_RESV_22              = 22,
   NAL_UNIT_RESV_23              = 23,
   NAL_UNIT_UNSPEC_24            = 24,
diff --git a/codec/common/src/common_tables.cpp b/codec/common/src/common_tables.cpp
index dcd20686..117b28d0 100644
--- a/codec/common/src/common_tables.cpp
+++ b/codec/common/src/common_tables.cpp
@@ -165,12 +165,12 @@ const EVclType g_keTypeMap[32][2] = {
   { NON_VCL,    NON_VCL },      // 13: NAL_UNIT_SPS_EXT
   { NON_VCL,    NON_VCL },      // 14: NAL_UNIT_PREFIX, NEED associate succeeded NAL to make a VCL
   { NON_VCL,    NON_VCL },      // 15: NAL_UNIT_SUBSET_SPS
-  { NON_VCL,    NON_VCL },      // 16: NAL_UNIT_RESV_16
+  { NON_VCL,    NON_VCL },      // 16: NAL_UNIT_DEPTH_PARAM
   { NON_VCL,    NON_VCL },      // 17: NAL_UNIT_RESV_17
   { NON_VCL,    NON_VCL },      // 18: NAL_UNIT_RESV_18
   { NON_VCL,    NON_VCL },      // 19: NAL_UNIT_AUX_CODED_SLICE
   { NON_VCL,    VCL     },      // 20: NAL_UNIT_CODED_SLICE_EXT
-  { NON_VCL,    NON_VCL },      // 21: NAL_UNIT_RESV_21
+  { NON_VCL,    NON_VCL },      // 21: NAL_UNIT_MVC_SLICE_EXT
   { NON_VCL,    NON_VCL },      // 22: NAL_UNIT_RESV_22
   { NON_VCL,    NON_VCL },      // 23: NAL_UNIT_RESV_23
   { NON_VCL,    NON_VCL },      // 24: NAL_UNIT_UNSPEC_24