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Lrn2comma, friend.
>
http://www.wvup.edu/jcc/pam/commas.htm
>Be sure that the word is an introductory word, not a modifier, before you use a comma after it. Also as illustrated below, no comma is necessary after the introductory word hence, thus, then, or still.
>However, necessary repairs must be made. (However is an introductory word.)
>However necessary the repairs may be, we cannot afford to make them now. (However functions as an adverb; it modifies the adjective necessary.)
>Thus we should test several types of machines first; then we should select the one that best meets our needs.