-e may be specified multiple times, as per SUSv2.

gnu/dist/grep/doc/grep.1

@@ -2,7 +2,7 @@
 .de Id
 .ds Dt \\$4
 ..
-.Id $Id: grep.1,v 1.1.1.1 1999/02/09 12:38:39 simonb Exp $
+.Id $Id: grep.1,v 1.2 1999/08/25 01:32:03 hubertf Exp $
 .TH GREP 1 \*(Dt "GNU Project"
 .SH NAME
 grep, egrep, fgrep \- print lines matching a pattern
@@ -139,7 +139,7 @@ option.
 Use
 .I PATTERN
 as the pattern; useful to protect patterns beginning with
-.BR \- .
+.BR \- . May be specified more than once.
 .TP
 .BI \-f " FILE" ", --file=" FILE
 Obtain patterns from