diff --git a/gnu/usr.bin/grep/grep.1 b/gnu/usr.bin/grep/grep.1
index 7736f8088ca8..877dd25795fb 100644
--- a/gnu/usr.bin/grep/grep.1
+++ b/gnu/usr.bin/grep/grep.1
@@ -202,6 +202,12 @@ Interpret
 as a list of fixed strings, separated by newlines,
 any of which is to be matched.
 .TP
+.BR \-P ", " \-\^\-perl-regexp
+Interpret
+.I PATTERN
+as a Perl regular expression.
+This option is not supported in FreeBSD.
+.TP
 .BI \-f " FILE" "\fR,\fP \-\^\-file=" FILE
 Obtain patterns from
 .IR FILE ,