diff --git a/py/bc0.h b/py/bc0.h
index 175ee263a0..fcb6eead5f 100644
--- a/py/bc0.h
+++ b/py/bc0.h
@@ -98,8 +98,8 @@
 
 #define MP_BC_MAKE_FUNCTION         (0x60) // uint
 #define MP_BC_MAKE_FUNCTION_DEFARGS (0x61) // uint
-#define MP_BC_MAKE_CLOSURE          (0x62) // uint
-#define MP_BC_MAKE_CLOSURE_DEFARGS  (0x63) // uint
+#define MP_BC_MAKE_CLOSURE          (0x62) // uint; byte
+#define MP_BC_MAKE_CLOSURE_DEFARGS  (0x63) // uint; byte
 #define MP_BC_CALL_FUNCTION         (0x64) // uint
 #define MP_BC_CALL_FUNCTION_VAR_KW  (0x65) // uint
 #define MP_BC_CALL_METHOD           (0x66) // uint