How to work with browserify?

[bonjs]

I use the browserify in my gulpfile, and it looks like :

return browserify({
            entries: entryFile,
            debug: true
        })
            .transform(vueify)
            .bundle()
            .pipe(source(outName))
            .pipe(buffer())
            //.pipe(rename({ extname: '.bundle.js' }))
            .pipe(gulp.dest(outPath))
            .pipe(connect.reload());

now I want to watch the files which are changed with gulp-change, what should I do ?