Don't understand "&" after string

In creating this function, what does the &guessword part mean? Thanks

 
int letterFill (char guess, string secretword, string &guessword)
It means the parameter guessword is passed by reference, rather than by value.

I take it you read part 1 of the tutorial. Now it's time for part 2
http://www.cplusplus.com/doc/tutorial/functions2/
Thanks, I'll try to understand it :D
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