Add a rough explanation of --extreme to output of --help.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/xz/message.c b/src/xz/message.c
index eba7205..ae9b590 100644
--- a/src/xz/message.c
+++ b/src/xz/message.c
@@ -1076,6 +1076,10 @@ message_help(bool long_help)
 "                      compression, 6-9 excellent compression; default is 6"));
 
 	puts(_(
+"  -e, --extreme       use more CPU time when encoding to increase compression\n"
+"                      ratio without increasing memory usage of the decoder"));
+
+	puts(_(
 "  -M, --memory=NUM    use roughly NUM bytes of memory at maximum; 0 indicates\n"
 "                      the default setting, which depends on the operation mode\n"
 "                      and the amount of physical memory (RAM)"));