diff --git a/src/simd/genfiles.go b/src/simd/genfiles.go
index be23b127c89..7f1035f6cf8 100644
--- a/src/simd/genfiles.go
+++ b/src/simd/genfiles.go
@@ -912,6 +912,7 @@ type SIMDLogicalOP uint8
 const (
 	// boolean simd operations, for reducing expression to VPTERNLOG* instructions
 	// sloInterior is set for non-root nodes in logical-op expression trees.
+	// the operations are even-numbered.
 	sloInterior SIMDLogicalOP = 1
 	sloNone SIMDLogicalOP = 2 * iota
 	sloAnd