diff --git a/crates/spirv_backend/src/lib.rs b/crates/spirv_backend/src/lib.rs
index dd26fa7..b2a0e81 100644
--- a/crates/spirv_backend/src/lib.rs
+++ b/crates/spirv_backend/src/lib.rs
@@ -84,3 +84,11 @@ steps!(f32, FullyGenericMaterial<f32>, step_h_generic_material_f32, step_e_gener
 steps!(f32, Iso3R1<f32>, step_h_iso_3r1_f32, step_e_iso_3r1_f32);
 steps!(R32, FullyGenericMaterial<R32>, step_h_generic_material_r32, step_e_generic_material_r32);
 steps!(R32, Iso3R1<R32>, step_h_iso_3r1_r32, step_e_iso_3r1_r32);
+
+// these should work, but require OpCapability Float64
+// we disable them for compatibility concerns: use the Cpu if you need f64 or temporarily uncomment
+// this and add the capability to the WgpuBackend driver.
+// steps!(f64, FullyGenericMaterial<f64>, step_h_generic_material_f64, step_e_generic_material_f64);
+// steps!(f64, Iso3R1<f64>, step_h_iso_3r1_f64, step_e_iso_3r1_f64);
+// steps!(R64, FullyGenericMaterial<R64>, step_h_generic_material_r64, step_e_generic_material_r64);
+// steps!(R64, Iso3R1<R64>, step_h_iso_3r1_r64, step_e_iso_3r1_r64);