diff --git a/lib/NintendoSDK/CMakeLists.txt b/lib/NintendoSDK/CMakeLists.txt
index a9c1a02e..fc72e0ae 100644
--- a/lib/NintendoSDK/CMakeLists.txt
+++ b/lib/NintendoSDK/CMakeLists.txt
@@ -34,6 +34,7 @@ add_library(NintendoSDK OBJECT
   include/nn/g3d/ResMaterial.h
   include/nn/g3d/ResFogAnim.h
   include/nn/g3d/ResModel.h
+  include/nn/g3d/World.h
   include/nn/nn.h
   include/nn/settings.h
   include/nn/hid.h
diff --git a/lib/NintendoSDK/include/nn/g3d/World.h b/lib/NintendoSDK/include/nn/g3d/World.h
new file mode 100644
index 00000000..90efe312
--- /dev/null
+++ b/lib/NintendoSDK/include/nn/g3d/World.h
@@ -0,0 +1,16 @@
+#pragma once
+
+namespace nn::g3d {
+
+class WorldMtxManip;
+
+class ICalculateWorldCallback {
+public:
+    // TODO
+    struct CallbackArg;
+
+    virtual ~ICalculateWorldCallback() = 0;
+    virtual void Exec(CallbackArg& arg, WorldMtxManip& manip) = 0;
+};
+
+}  // namespace nn::g3d