Proper way to comment a file with several related classes



Are there any convention/best practices about comments on a file containing multiple related classes? I need to put a comment that relates to all the classes I’ve declared in the file but I’m not sure If having a simple block comment like this /* bla bla */ or this /** bla bla */ is ok or not.
The official guide KDoc does not treat a similar use-case and I’m wondering whether my doubt is legit or simply similar comments are not expected or not yet supported.