diff --git a/onnxslim/argparser.py b/onnxslim/argparser.py
index b5a3a1a..769b909 100644
--- a/onnxslim/argparser.py
+++ b/onnxslim/argparser.py
@@ -1,4 +1,6 @@
+import sys
 import argparse
+from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
 import dataclasses
 from dataclasses import dataclass, field
 from typing import List, Optional, Type
@@ -109,8 +111,11 @@ class CheckerArguments:
     verbose: bool = field(default=False, metadata={"help": "verbose mode, default False."})
 
 
-class ArgumentParser:
-    def __init__(self, *argument_dataclasses: Type):
+class OnnxSlimArgumentParser(ArgumentParser):
+    def __init__(self, *argument_dataclasses: Type, **kwargs):
+        if "formatter_class" not in kwargs:
+            kwargs["formatter_class"] = ArgumentDefaultsHelpFormatter
+        super().__init__(**kwargs)
         self.argument_dataclasses = argument_dataclasses
         self.parser = argparse.ArgumentParser(
             description="OnnxSlim: A Toolkit to Help Optimizer Onnx Model",
diff --git a/onnxslim/cli/_main.py b/onnxslim/cli/_main.py
index 6bcbbd2..f02460f 100644
--- a/onnxslim/cli/_main.py
+++ b/onnxslim/cli/_main.py
@@ -123,14 +123,14 @@ def slim(model: Union[str, onnx.ModelProto], *args, **kwargs):
 def main():
     """Entry point for the OnnxSlim toolkit, processes command-line arguments and passes them to the slim function."""
     from onnxslim.argparser import (
-        ArgumentParser,
+        OnnxSlimArgumentParser,
         CheckerArguments,
         ModelArguments,
         ModificationArguments,
         OptimizationArguments,
     )
 
-    argument_parser = ArgumentParser(ModelArguments, OptimizationArguments, ModificationArguments, CheckerArguments)
+    argument_parser = OnnxSlimArgumentParser(ModelArguments, OptimizationArguments, ModificationArguments, CheckerArguments)
     model_args, optimization_args, modification_args, checker_args = argument_parser.parse_args_into_dataclasses()
 
     if checker_args.inspect and model_args.output_model: