1. A method of annotating an electronic text document, the method comprising: evaluating, by a computer, the electronic text document for one or more multi-word expressions comprising a first word and a second word; if a multi-word expression is found in the electronic text document, storing an abbreviation of the multi-word expression; evaluating the electronic text document for occurrences of the abbreviation after a location of the multi-word expression; and if an occurrence of the abbreviation is found following the multi-word expression, annotating the occurrence of the abbreviation with the multi-word expression.