diff --git a/pytchat/cli/__init__.py b/pytchat/cli/__init__.py
index 0bd99b3..6c95e19 100644
--- a/pytchat/cli/__init__.py
+++ b/pytchat/cli/__init__.py
@@ -22,9 +22,10 @@ def main():
     # Arguments 
     parser = argparse.ArgumentParser(description=f'pytchat v{__version__}')
     parser.add_argument('-v', f'--{Arguments.Name.VIDEO}', type=str,
-         help='Video IDs separated by commas without space')
+         help='Video IDs separated by commas without space.\n'
+         'If ID starts with a hyphen (-), enclose the ID in square brackets.')
     parser.add_argument('-o', f'--{Arguments.Name.OUTPUT}', type=str,
-         help='Output directory (end with "/")', default='./')
+         help='Output directory (end with "/"). default="./"', default='./')
     parser.add_argument(f'--{Arguments.Name.VERSION}', action='store_true',
          help='Settings version')
     Arguments(parser.parse_args().__dict__)
diff --git a/tests/test_calculator_parse.py b/tests/test_calculator_parse.py
index f845182..be0c1bf 100644
--- a/tests/test_calculator_parse.py
+++ b/tests/test_calculator_parse.py
@@ -36,7 +36,7 @@ def test_process_0():
     chat_component = {
         'video_id':'',
         'timeout':10,
-        'chatdata':load_chatdata(r"tests\testdata\calculator\superchat_0.json")
+        'chatdata':load_chatdata(r"tests/testdata/calculator/superchat_0.json")
     }
     assert SuperchatCalculator().process([chat_component])=={'￥': 6800.0, '€': 2.0}
 
@@ -47,7 +47,7 @@ def test_process_1():
     chat_component = {
         'video_id':'',
         'timeout':10,
-        'chatdata':load_chatdata(r"tests\testdata\calculator\text_only.json")
+        'chatdata':load_chatdata(r"tests/testdata/calculator/text_only.json")
     }
     assert SuperchatCalculator().process([chat_component])=={}
 
@@ -59,7 +59,7 @@ def test_process_2():
         chat_component = {
             'video_id':'',
             'timeout':10,
-            'chatdata':load_chatdata(r"tests\testdata\calculator\replay_end.json")
+            'chatdata':load_chatdata(r"tests/testdata/calculator/replay_end.json")
         }
         assert False
         SuperchatCalculator().process([chat_component])