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| -rw-r--r-- | src/join.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/join.c b/src/join.c index 68156191a..2dfbb0750 100644 --- a/src/join.c +++ b/src/join.c @@ -163,6 +163,7 @@ Usage: %s [OPTION]... FILE1 FILE2\n\ For each pair of input lines with identical join fields, write a line to\n\ standard output. The default join field is the first, delimited\n\ by whitespace. When FILE1 or FILE2 (not both) is -, read standard input.\n\ +FILE1 and FILE2 should be sorted on the join fields.\n\ \n\ -a FILENUM print unpairable lines coming from file FILENUM, where\n\ FILENUM is 1 or 2, corresponding to FILE1 or FILE2\n\ |