diff --git a/wgpu/src/triangle/msaa.rs b/wgpu/src/triangle/msaa.rs
index 0bddfc09..fa752d58 100644
--- a/wgpu/src/triangle/msaa.rs
+++ b/wgpu/src/triangle/msaa.rs
@@ -254,6 +254,9 @@ impl Targets {
 struct Ratio {
     u: f32,
     v: f32,
+    // Padding fields to make Ratio 16 byte aligned
+    //
+    // See https://docs.rs/wgpu/latest/wgpu/struct.DownlevelFlags.html#associatedconstant.BUFFER_BINDINGS_NOT_16_BYTE_ALIGNED
     p0: f32,
     p1: f32,
 }