Update README.md

README.md

@@ -34,7 +34,7 @@ https://www.python.org/dev/peps/pep-0008/#prescriptive-naming-conventions
 ## we have subdirectories for the code, one for each chapter
 
 ## things like 'node' are inside classes, no leading underscore
-## file names are file_name (and not CamelCase, adjustting from algs4)
+## file names, variables, methods are file_name (and not CamelCase, adjustting from algs4), only classes are CamelCase (PascalCase)
 ## there is one file per version of an algorithm / data structure (like in algs4), the name, and importantly the docstring, reflects which version it is
 ## java main becomes __main__ stuff; follow what is there; adjust the initial comment
 ## don't replicate imports unless