diff --git a/taichi/program/kernel.h b/taichi/program/kernel.h
index a3d6609cf2264..7b0bf7d9cded8 100644
--- a/taichi/program/kernel.h
+++ b/taichi/program/kernel.h
@@ -35,6 +35,7 @@ class TI_DLL_EXPORT Kernel : public Callable {
 
     void set_arg_float(int arg_id, float64 d);
 
+    // Created signed and unsigned version for argument range check of pybind
     void set_arg_int(int arg_id, int64 d);
     void set_arg_uint(int arg_id, uint64 d);