diff --git a/utilities_win32.cpp b/utilities_win32.cpp
index e218586..96b4e75 100644
--- a/utilities_win32.cpp
+++ b/utilities_win32.cpp
@@ -85,8 +85,9 @@ using ACCENT_STATE = enum _ACCENT_STATE
     ACCENT_ENABLE_GRADIENT = 1,
     ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
     ACCENT_ENABLE_BLURBEHIND = 3,
-    ACCENT_ENABLE_ACRYLICBLURBEHIND = 4,
-    ACCENT_INVALID_STATE = 5
+    ACCENT_ENABLE_ACRYLICBLURBEHIND = 4, // RS4 1803
+    ACCENT_ENABLE_HOSTBACKDROP = 5, // RS5 1809
+    ACCENT_INVALID_STATE = 6
 };
 
 using ACCENT_POLICY = struct _ACCENT_POLICY