Including a new file in Bison sources

[Satya]

hi,
I am not an expert with automake, but I need some quick help here...
if I write two new source files in Bison:

src/hello.h
src/hello.c

later I need to #include "hello.h" in some existing file like main.c
and call functions in hello.c from here;

what parts of the Makefile.am file do I need to change in order to get
these two compiled along with the rest of Bison souce files?

Thanks!
./satya