diff --git a/naga/tests/in/cross.wgsl b/naga/tests/in/cross.wgsl
index 5dc16fe9f0..cfdd7622c3 100644
--- a/naga/tests/in/cross.wgsl
+++ b/naga/tests/in/cross.wgsl
@@ -1,3 +1,4 @@
+// NOTE: invalid combinations are tested in the `validation::bad_cross_builtin_args` test.
 @compute @workgroup_size(1) fn main() {
     let a = cross(vec3(0., 1., 2.), vec3(0., 1., 2.));
 }
diff --git a/naga/tests/validation.rs b/naga/tests/validation.rs
index 748057a894..c7af7b4c01 100644
--- a/naga/tests/validation.rs
+++ b/naga/tests/validation.rs
@@ -264,6 +264,7 @@ fn emit_workgroup_uniform_load_result() {
 #[cfg(feature = "wgsl-in")]
 #[test]
 fn bad_cross_builtin_args() {
+    // NOTE: Things we expect to actually compile are in the `cross` snapshot test.
     let cases = [
         (
             "vec2(0., 1.)",