Example: ``` js var gulp = require('gulp'); var sass = require('gulp-sass'); gulp.task('sass', function() { gulp.src('**/*.{scss,sass}') .pipe(sass({ sourceComments: true, outputStyle: 'expanded', errLogToConsole: true })) .pipe(gulp.dest('screen.css')); }); gulp.task('watch', ['sass'], function() { var sassWatcher = gulp.watch('**/*.{scss,sass}', ['sass']); }); ``` When I call `gulp sass` it generates source comments, as expected. But when I run `gulp watch` no source comments get generated.