UK TeX FAQ -- question label hyphexcept

### Hyphenation exceptions

While TeX's hyphenation rules are good, they're not infallible: you will occasionally find words TeX just gets wrong. So for example, TeX's default hyphenation (for American English) don't know the word "manuscript", and since it's a long word you may find you need to hyphenate it. You can "write the hyphenation out" each time you use the word:

>     ... man\-u\-script ...

Here, each of the `\``-` commands is converted to a hyphenated break, if (and only if) necessary.

That technique can rapidly become tedious: you'll probably only accept it if there are no more than one or two wrongly-hyphenated words in your document. The alternative is to set up hyphenations in the document preamble. To do that, for the hyphenation above, you would write:

>     \hyphenation{man-u-script}

and the hyphenation would be set for the whole document. Barbara Beeton publishes articles containing lists of these "hyphenation exceptions", in TUGboat; the hyphenation 'man-u-script' comes from one of those articles.

What if you have more than one language in your document? Simple: select the appropriate language, and do the same as above:

>     \usepackage[french]{babel}
>     \selectlanguage{french}
>     \hyphenation{re-cher-cher}

(nothing clever here: this is the "correct" hyphenation of the word, in the current tables). However, there's a problem here: just as words with accents in them won't break, so `\``hyphenation` commands with accents in them produce an error:

>     \usepackage[french]{babel}
>     \selectlanguage{french}
>     \hyphenation{r\'e-f\'e-rence}

tells us that the hyphenation is "improper", and that it will be "flushed". But, just as hyphenation of words is enabled by selecting an 8-bit font encoding, so `\``hyphenation` commands are rendered proper again by selecting that same 8-bit font encoding. For the hyphenation patterns provided in the usual distributions, the encoding is Cork, so the complete sequence is:

>     \usepackage[T1]{fontenc}
>     \usepackage[french]{babel}
>     \selectlanguage{french}
>     \hyphenation{r\'e-f\'e-rence}

The same sort of performance goes for any language for which 8-bit fonts and corresponding hyphenation patterns are available. Since you have to select both the language and the font encoding to have your document typeset correctly, it should not be a great imposition to do the selections before setting up hyphenation exceptions.

This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=hyphexcept