--- doc/grep.1.orig 2004-09-03 19:50:01.000000000 -0700 +++ doc/grep.1 2004-09-03 19:51:46.000000000 -0700 @@ -649,6 +649,10 @@ instead of reporting a syntax error in the regular expression. \s-1POSIX.2\s0 allows this behavior as an extension, but portable scripts should avoid it. +.PP +For more information see +.IR "re_format" (7). +.X .SH "ENVIRONMENT VARIABLES" Grep's behavior is affected by the following environment variables. .PP