add comments

tox.ini

@@ -6,7 +6,7 @@ skipsdist = True        # skip creating package
 deps = -rrequirements-tox.txt          # dependency
 ; commands = pytest tests/ --verbose --disable-warnings     # testcases
 
-; we can also execute differet testing files with diff python versions
+; we can also execute differet testing files on diff python versions
 [testenv:py39]
 basepython = python3.9
 commands = pytest tests/ --verbose --disable-warnings
@@ -15,3 +15,8 @@ commands = pytest tests/ --verbose --disable-warnings
 basepython = python3.12
 commands = pytest tests/ --verbose --disable-warnings
 
+; for mutiple commands
+; commands = 
+;           command1
+;           command2
+;           command3