diff --git a/doc/man/s3fs.1 b/doc/man/s3fs.1
index 3047d64..824f42b 100644
--- a/doc/man/s3fs.1
+++ b/doc/man/s3fs.1
@@ -303,6 +303,11 @@ utf-8 by mapping offending codes into a 'private' codepage of the
 Unicode set.
 Useful on clients not using utf-8 as their file system encoding.
 .TP
+\fB\-o\fR use_session_token - indicate that session token should be provided.
+If credentials are provided by environment variables this switch
+forces presence check of AWSSESSIONTOKEN variable.
+Otherwise an error is returned.
+.TP
 \fB\-o\fR dbglevel (default="crit")
 Set the debug message level. set value as crit (critical), err (error), warn (warning), info (information) to debug level. default debug level is critical.
 If s3fs run with "-d" option, the debug level is set information.
diff --git a/src/s3fs_util.cpp b/src/s3fs_util.cpp
index 4c88ef3..9b5642a 100644
--- a/src/s3fs_util.cpp
+++ b/src/s3fs_util.cpp
@@ -1039,6 +1039,12 @@ void show_help ()
     "      - store object with specified storage class.  Possible values:\n"
     "        standard, standard_ia, onezone_ia and reduced_redundancy.\n"
     "\n"
+    "   use_rrs (default is disable)\n"
+    "      - use Amazon's Reduced Redundancy Storage.\n"
+    "        this option can not be specified with use_sse.\n"
+    "        (can specify use_rrs=1 for old version)\n"
+    "        this option has been replaced by new storage_class option.\n"
+    "\n"
     "   use_sse (default is disable)\n"
     "      - Specify three type Amazon's Server-Site Encryption: SSE-S3,\n"
     "        SSE-C or SSE-KMS. SSE-S3 uses Amazon S3-managed encryption\n"