diff --git a/Include/internal/pycore_lock.h b/Include/internal/pycore_lock.h
index 07bf3db16f3..c89159b55e1 100644
--- a/Include/internal/pycore_lock.h
+++ b/Include/internal/pycore_lock.h
@@ -26,6 +26,9 @@ extern "C" {
 // Typical initialization:
 //   PyMutex m = (PyMutex){0};
 //
+// Or initialize as global variables:
+//   static PyMutex m;
+//
 // Typical usage:
 //   PyMutex_Lock(&m);
 //   ...