diff --git a/drm/DrmAtomicStateManager.h b/drm/DrmAtomicStateManager.h
index 8d22b99..4af04d1 100644
--- a/drm/DrmAtomicStateManager.h
+++ b/drm/DrmAtomicStateManager.h
@@ -40,6 +40,7 @@
   std::shared_ptr<drm_color_ctm> color_matrix;
   std::optional<Colorspace> colorspace;
   std::optional<int32_t> content_type;
+  std::shared_ptr<hdr_output_metadata> hdr_metadata;
 
   std::shared_ptr<DrmFbIdHandle> writeback_fb;
   SharedFd writeback_release_fence;
@@ -84,6 +85,7 @@
 
     DrmModeUserPropertyBlobUnique mode_blob;
     DrmModeUserPropertyBlobUnique ctm_blob;
+    DrmModeUserPropertyBlobUnique hdr_metadata_blob;
 
     int release_fence_pt_index{};