diff --git a/CVar-system.md b/CVar-system.md
index 9b848e1..1c37fde 100644
--- a/CVar-system.md
+++ b/CVar-system.md
@@ -12,4 +12,5 @@ The system code is one of:
 |---------|------|----------|
 | runtime | rt     | rt_AsssetEnabled |
 | renderer | r    | r_MaxRenderResources |
+| vulkan-backend | r_Vk<Name> | r_VkPhysDeviceName |
 | launcher | l    | l_WindowTitle |