diff --git a/README.md b/README.md
index d1389945..a4432505 100644
--- a/README.md
+++ b/README.md
@@ -75,8 +75,11 @@ Name | Function
 `-DBACKEND_RENDERER=Software` | Use the handwritten software renderer
 `-DBACKEND_AUDIO=SDL2` | Use the SDL2-driven software audio-mixer
 `-DBACKEND_AUDIO=miniaudio` | Use the miniaudio-driven software audio-mixer
+`-DBACKEND_AUDIO=Null` | Use the dummy audio backend (doesn't produce any sound)
 `-DBACKEND_PLATFORM=SDL2` | Use SDL2 for windowing and OS-abstraction
 `-DBACKEND_PLATFORM=GLFW3` | Use GLFW3 for windowing and OS-abstraction
+`-DBACKEND_PLATFORM=WiiU` | Target the Wii U natively
+`-DBACKEND_PLATFORM=Null` | Use the dummy platform backend (doesn't do anything)
 `-DLTO=ON` | Enable link-time optimisation
 `-DPKG_CONFIG_STATIC_LIBS=ON` | On platforms with pkg-config, static-link the dependencies (good for Windows builds, so you don't need to bundle DLL files)
 `-DMSVC_LINK_STATIC_RUNTIME=ON` | Link the static MSVC runtime library (Visual Studio only)