diff --git a/lm-c99/tests/test_ig_c99/ig-c99/idl_core.h.target b/lm-c99/tests/test_ig_c99/ig-c99/idl_core.h.target
index 81a905c..b6bb2b5 100644
--- a/lm-c99/tests/test_ig_c99/ig-c99/idl_core.h.target
+++ b/lm-c99/tests/test_ig_c99/ig-c99/idl_core.h.target
@@ -8,8 +8,10 @@ extern "C" {
 // -------------
 typedef char* string;
 typedef char* binary;
+// no typedef required for idl-basetype: int
 typedef unsigned int uint;
 typedef size_t size;
+// no typedef required for idl-basetype: bool
 typedef void* opaque;