With more editing and typesetting being performed on computers, the esoteric proofreader's marks are falling into disuse, but their principles still apply to blueline and galley proofs. Unlike corrections on manuscripts, corrections on proofs must always be put in the margin, left or right, next to the line of type in which the correction is to be made. A mark within the line -- a caret for an addition, a line through a letter or word to be deleted -- will indicate where the correction is to be made. A correction or addition should never be written above a line of type. The typesetters, who are responsible for making the corrections, only scan the margins, and will not look for writing buried between lines of type. When more than one alteration is to be made in a line, corrections should be marked in the margin in the order they are to be made in the line, reading from left to right; with a vertical or slant line separating one correction from the next. Every mark in the margin requires a mark in the line, and vice versa. Where many corrections occur in a line or two, it is best to cross out the whole passage containing the errors, and write it all correctly in the margin. A longer correction or addition should be typed onto a separate slip, and fastened to one end of the proof. A circled note in the margin reading "insert attached", with a caret in the line to show where it goes, will alert the typesetter. When correcting proofs, authors and editors should use an ink or pencil color (see blue- / red-pencil) different from that used by the proofreader. See AA, ALL CAPS, BF, C&IC, CAP, CAP&LC, CAP&SC, caret, end sign, H&J, ITAL, LC, ms, number sign, OC, paragraph sign, PE, ROM, section sign, SP, STET, (TK), TR, U&LC, WF, (00), typographical error, notation.