### Keeping copyright notices or other comments
You can pass `--comments` to retain certain comments in the output. By
-default it will keep JSDoc-style comments that contain "@preserve" or
-"@license". You can pass `--comments all` to keep all the comments, or a
-valid JavaScript regexp to keep only comments that match this regexp. For
-example `--comments '/foo|bar/'` will keep only comments that contain "foo"
-or "bar".
+default it will keep JSDoc-style comments that contain "@preserve",
+"@license" or "@cc_on" (conditional compilation for IE). You can pass
+`--comments all` to keep all the comments, or a valid JavaScript regexp to
+keep only comments that match this regexp. For example `--comments
+'/foo|bar/'` will keep only comments that contain "foo" or "bar".
Note, however, that there might be situations where comments are lost. For
example: