how to ask grep to search specific file recurisively?

[loody <miloody@xxxxxxxxx>]

Dear all:
"grep 'test' *.h" will search pattern "test" in all header file at the
current folder.
if I want grep do the same thing recursively, I try to use "grep -r
'test' *.h" and it complains no *.h such file.
Would anyone know how to use grep to search specific file recursively?
appreciate your help,
miloody

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