Found the following hamletworks.org entries referring to line 388

View Commentary Note for 388
388 Marcellus, and Barnardo, on their watch1.2.197

View Immaterial Textual Note for 388
388 Marcellus, and Barnardo, on their watch1.2.197

View Material Textual Note for 388
388 Marcellus, and Barnardo, on their watch1.2.197