PEP 465: a dedicated infix operator for matrix multiplication (closes #21176)
diff --git a/Include/object.h b/Include/object.h
index 7584d4c..f3c87eb 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -275,6 +275,9 @@
     binaryfunc nb_inplace_true_divide;
 
     unaryfunc nb_index;
+
+    binaryfunc nb_matrix_multiply;
+    binaryfunc nb_inplace_matrix_multiply;
 } PyNumberMethods;
 
 typedef struct {