The keyword builder is a dialog which allows you to create and modify colorization definitions. A colorizer definition is needed to tell CRiSP how to perform colorization of keywords for files of a particular type. CRiSP comes with a variety of supported languages, but you can use this dialog to create your own or to modify a supplied definition. For example, you might be programming in C and want to add custom function libraries so that they are colored in a different color.