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$ man -P cat grep | grep context -A3

Print NUM lines of trailing context after matching lines.
Places a line containing -- between contiguous groups of
matches.

--
Print NUM lines of leading context before matching lines.
Places a line containing -- between contiguous groups of
matches.

--
Print NUM lines of output context. Places a line containing --
between contiguous groups of matches.

-b, --byte-offset
--
the presence of trailing context lines. This enables a calling
process to resume a search. When grep stops after NUM matching
lines, it outputs any trailing context lines. When the -c or
--count option is also used, grep does not output a count
greater than NUM. When the -v or --invert-match option is also
used, grep stops after outputting NUM non-matching lines.

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