diff --git a/‎pywt/_extensions/c/common.h‎
Lines changed: 5 additions & 3 deletions b/‎pywt/_extensions/c/common.h‎
Lines changed: 5 additions & 3 deletions
@@ -44,9 +44,11 @@
  *
  * For templating, the typedef names must not contain spaces.
  *
- * PYWT_TEST_STRUCT_COMPLEX forces the struct representation (NumPy's C++
- * branch) so that the MSVC code path can be compiled and tested with any
- * compiler.
+ * PYWT_TEST_STRUCT_COMPLEX is a testing hook: it swaps in plain structs with
+ * the same layout and no operators, so that MSVC-like semantics can be
+ * compiled and tested with any compiler (used by the struct-complex CI job).
+ * The structs match the ones NumPy's headers use when compiled as C++, where
+ * C99 `_Complex` is also unavailable.
  */
 
 #ifdef PYWT_TEST_STRUCT_COMPLEX
Original file line number	Diff line number	Diff line change
`@@ -44,9 +44,11 @@`
`44`	`44`	`*`
`45`	`45`	`* For templating, the typedef names must not contain spaces.`
`46`	`46`	`*`
`47`		`- * PYWT_TEST_STRUCT_COMPLEX forces the struct representation (NumPy's C++`
`48`		`- * branch) so that the MSVC code path can be compiled and tested with any`
`49`		`- * compiler.`
	`47`	`+ * PYWT_TEST_STRUCT_COMPLEX is a testing hook: it swaps in plain structs with`
	`48`	`+ * the same layout and no operators, so that MSVC-like semantics can be`
	`49`	`+ * compiled and tested with any compiler (used by the struct-complex CI job).`
	`50`	`+ * The structs match the ones NumPy's headers use when compiled as C++, where`
	`51`	+ * C99 `_Complex` is also unavailable.
`50`	`52`	`*/`
`51`	`53`
`52`	`54`	`#ifdef PYWT_TEST_STRUCT_COMPLEX`