Change as below:
- add an entry for test_lookup_perf in manual
- fix wrong parameter in usage of test_lookup_perf

Signed-off-by: Chao Yu <chao@kernel.org>
---
 man/f2fs_io.8           | 3 +++
 tools/f2fs_io/f2fs_io.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/man/f2fs_io.8 b/man/f2fs_io.8
index e0f659e..0d69b5f 100644
--- a/man/f2fs_io.8
+++ b/man/f2fs_io.8
@@ -184,6 +184,9 @@ Get i_advise value and info in file
 .TP
 \fBioprio\fR \fI[hint] [file]\fR
 Set ioprio to the file. The ioprio can be ioprio_write.
+.TP
+\fBtest_lookup_perf\fR \fI[-i] [-v] <dir> <num_files>\fR
+Measure readdir/stat speed
 .SH AUTHOR
 This version of
 .B f2fs_io
diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 8e81ba9..f282190 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -2241,7 +2241,7 @@ static void do_test_create_perf(int argc, char **argv, const struct cmd_desc *cm
 
 #define test_lookup_perf_desc "measure readdir/stat speed"
 #define test_lookup_perf_help						\
-"f2fs_io test_lookup_perf [-s] [-S] <dir> <num_files>\n\n"		\
+"f2fs_io test_lookup_perf [-i] [-v] <dir> <num_files>\n\n"		\
 "Measures readdir/stat performance.\n"				\
 "  <dir>          The target directory in where it will test on.\n"	\
 "  <num_files>    The total number of files the test will initialize or test.\n"\
-- 
2.49.0