1 files changed, 1 insertions, 1 deletions
diff --git a/zcmp.cc b/zcmp.cc
index 365e76b..68e219e 100644
--- a/zcmp.cc
+++ b/zcmp.cc
@@ -73,7 +73,7 @@ void show_help()
                "  -b, --print-bytes                 print differing bytes\n"
                "  -i, --ignore-initial=<n>[,<n2>]   ignore differences in the first <n> bytes\n"
                "  -l, --list                        list position, value of all differing bytes\n"
-               "  -M, --format=<list>               exclude formats not in <list>\n"
+               "  -M, --format=<list>               process only the formats in <list>\n"
                "  -n, --bytes=<n>                   compare at most <n> bytes\n"
                "  -N, --no-rcfile                   don't read runtime configuration file\n"
                "  -O, --force-format=[<f1>][,<f2>]  force given formats (bz2, gz, lz, xz)\n"