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15.3 '@-' and '@hyphenation': Helping TeX Hyphenate
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Although TeX's hyphenation algorithm is generally pretty good, it does
miss useful hyphenation points from time to time.  (Or, far more rarely,
insert an incorrect hyphenation.)  So, for documents with an unusual
vocabulary or when fine-tuning for a printed edition, you may wish to
help TeX out.  Texinfo supports two commands for this:

'@-'
     Insert a discretionary hyphen, i.e., a place where TeX can (but
     does not have to) hyphenate.  This is especially useful when you
     notice an overfull hbox is due to TeX missing a hyphenation (Note:
     Overfull hboxes).  TeX will not insert any hyphenation points
     itself into a word containing '@-'.

'@hyphenation{HY-PHEN-A-TED WORDS}'
     Tell TeX how to hyphenate HY-PHEN-A-TED WORDS.  As shown, you put a
     '-' at each hyphenation point.  For example:
          @hyphenation{man-u-script man-u-scripts}
     TeX only uses the specified hyphenation points when the words match
     exactly, so give all necessary variants, such as plurals.

  Info, HTML, and other non-TeX output is not hyphenated, so none of
these commands have any effect there.