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-A hyphen (-) is a punctuation mark used to join words (e.g. in "thirty-year-old piano") as compound modifiers, and sometimes to separate syllables of a single word (e.g. "re-educate") to either avoid ambiguity or separate two parts of a single word across a line break. Conventions do vary by style guide. 
+A hyphen (-) is a punctuation mark used to join words (e.g. in "thirty-year-old piano") as compound modifiers, and sometimes to separate syllables of a single word to avoid ambiguity (e.g. "co-op" vs. "coop"), to aid in pronunciation (e.g. "co-opt"), or separate two parts of a single word across a line break. Conventions do vary by style guide.
 
-The hyphen should not be confused the minus sign (−); with an en-dash (–), or an em-dash (—); or with the horizontal bar (―), which can vary in length. 
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+The hyphen should not be confused the minus sign (−); with an en-dash (–), or an em-dash (—); or with the horizontal bar (―), which can vary in length.
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