using find with grep

[Rick Weinbender <lsrwein@central-ph.k12.mo.us>]

I have an expression that searches within files
of a particular type and displays the output.
But I would ALSO like it to display the directory
for each find occurence.
The command below works, but won't give me
the directory.

find /home -name *.txt -exec grep searchstring {} \;

Any help would be much appreciated,

-Rick