diff --git a/runtests.py b/runtests.py
index 28b2982..fdf1697 100755
--- a/runtests.py
+++ b/runtests.py
@@ -4,8 +4,9 @@
 
 Usage::
 
-    python3 test_matrix.py
-    python3 test_matrix.py -v # verbose mode
+    python3 runtests.py
+    python3 runtests.py --verbose
+    python3 runtests.py --current --verbose
 """
 from __future__ import absolute_import
 from __future__ import print_function
diff --git a/tests/test_pythoncapi_compat_cext.c b/tests/test_pythoncapi_compat_cext.c
index a97f813..83969af 100644
--- a/tests/test_pythoncapi_compat_cext.c
+++ b/tests/test_pythoncapi_compat_cext.c
@@ -1575,7 +1575,7 @@ static struct PyModuleDef module_def = {
     PyModuleDef_HEAD_INIT,
     MODULE_NAME_STR,     // m_name
     _Py_NULL,            // m_doc
-    0,                   // m_doc
+    0,                   // m_size
     methods,             // m_methods
 #if PY_VERSION_HEX >= 0x03050000
     module_slots,        // m_slots