diff --git a/doc/grep.in.1 b/doc/grep.in.1
index 58a6c0e..3e6a8cf 100644
--- a/doc/grep.in.1
+++ b/doc/grep.in.1
@@ -377,7 +377,7 @@ Print
 .I NUM
 lines of trailing context after matching lines.
 Places a line containing a group separator
-.RB ( \-\^\- )
+.RB "(described under " \-\^\-group\-separator )
 between contiguous groups of matches.
 With the
 .B \-o
@@ -390,7 +390,7 @@ Print
 .I NUM
 lines of leading context before matching lines.
 Places a line containing a group separator
-.RB ( \-\^\- )
+.RB "(described under " \-\^\-group\-separator )
 between contiguous groups of matches.
 With the
 .B \-o
@@ -403,13 +403,24 @@ Print
 .I NUM
 lines of output context.
 Places a line containing a group separator
-.RB ( \-\^\- )
+.RB "(described under " \-\^\-group\-separator )
 between contiguous groups of matches.
 With the
 .B \-o
 or
 .B \-\^\-only\-matching
 option, this has no effect and a warning is given.
+.TP
+.BI \-\^\-group\-separator= SEP
+Use
+.I SEP
+as a group separator. By default
+.I SEP
+is double hyphen
+.RB ( \-\^\- ).
+.TP
+.B \-\^\-no\-group-separator
+Use empty string as a group separator.
 .SS "File and Directory Selection"
 .TP
 .BR \-a ", " \-\^\-text
diff --git a/src/grep.c b/src/grep.c
index ec955d8..7e07f06 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -1606,6 +1606,8 @@ Context control:\n\
 "));
       printf (_("\
   -NUM                      same as --context=NUM\n\
+      --group-separator=SEP use SEP as a group separator\n\
+      --no-group-separator  use empty string as a group separator\n\
       --color[=WHEN],\n\
       --colour[=WHEN]       use markers to highlight the matching strings;\n\
                             WHEN is 'always', 'never', or 'auto'\n\