diff --git a/include/vkd3d_d3d12.idl b/include/vkd3d_d3d12.idl
index 03f62b07..e239f514 100644
--- a/include/vkd3d_d3d12.idl
+++ b/include/vkd3d_d3d12.idl
@@ -1104,6 +1104,8 @@ typedef enum D3D12_ROOT_SIGNATURE_FLAGS
     D3D12_ROOT_SIGNATURE_FLAG_LOCAL_ROOT_SIGNATURE = 0x80,
     D3D12_ROOT_SIGNATURE_FLAG_DENY_AMPLIFICATION_SHADER_ROOT_ACCESS = 0x100,
     D3D12_ROOT_SIGNATURE_FLAG_DENY_MESH_SHADER_ROOT_ACCESS = 0x200,
+    D3D12_ROOT_SIGNATURE_FLAG_CBV_SRV_UAV_HEAP_DIRECTLY_INDEXED = 0x400,
+    D3D12_ROOT_SIGNATURE_FLAG_SAMPLER_HEAP_DIRECTLY_INDEXED = 0x800,
 } D3D12_ROOT_SIGNATURE_FLAGS;
 cpp_quote("DEFINE_ENUM_FLAG_OPERATORS(D3D12_ROOT_SIGNATURE_FLAGS);")