sequelize/sequelize-doc — pull request #82 by chill117 (2013-10-08 03:11:37+00:00)
Title: Added an example of how to set the value of the field that a setter is b...

...eing executed on.

See this question (http://stackoverflow.com/q/18049211/1157309) and answer (http://stackoverflow.com/a/19238288/1157309) on StackOverflow with an explanation of the confusion surrounding setters.