diff --git a/cidre/src/mtl.rs b/cidre/src/mtl.rs
index d760a097..f5517600 100644
--- a/cidre/src/mtl.rs
+++ b/cidre/src/mtl.rs
@@ -18,6 +18,7 @@ pub use acceleration_structure::AccelerationStruct;
 pub use acceleration_structure::Desc as AccelerationStructDesc;
 pub use acceleration_structure::GeometryDesc as AccelerationStructGeometryDesc;
 pub use acceleration_structure::InstanceOpts as AccelerationStructInstanceOpts;
+pub use acceleration_structure::MatrixLayout;
 pub use acceleration_structure::MotionBorderMode;
 pub use acceleration_structure::MotionBoundingBoxGeometryDesc;
 pub use acceleration_structure::Usage as AccelerationStructUsage;
diff --git a/cidre/src/mtl/acceleration_structure.rs b/cidre/src/mtl/acceleration_structure.rs
index 83acf17e..161b8e51 100644
--- a/cidre/src/mtl/acceleration_structure.rs
+++ b/cidre/src/mtl/acceleration_structure.rs
@@ -38,6 +38,19 @@ pub enum InstanceOpts {
     NonOpaque = (1 << 3),
 }
 
+#[derive(Copy, Clone, Eq, PartialEq)]
+#[doc(alias = "MTLMatrixLayout")]
+#[repr(isize)]
+pub enum MatrixLayout {
+    /// Column-major order
+    #[doc(alias = "MTLMatrixLayoutColumnMajor")]
+    ColumnMajor = 0,
+
+    /// Row-major order
+    #[doc(alias = "MTLMatrixLayoutRowMajor")]
+    RowMajor,
+}
+
 define_obj_type!(pub Desc(ns::Id));
 
 impl Desc {