diff --git a/doc/man/s3fs.1 b/doc/man/s3fs.1
index 141b8cb..a964f53 100644
--- a/doc/man/s3fs.1
+++ b/doc/man/s3fs.1
@@ -306,6 +306,14 @@ If you specify no argument as an option, objects older than 24 hours(24H) will b
 You can specify an optional date format.
 It can be specified as year, month, day, hour, minute, second, and it is expressed as "Y", "M", "D", "h", "m", "s" respectively.
 For example, "1Y6M10D12h30m30s".
+.TP
+\fB\-o\fR use_wtf8 - support arbitrary file system encoding.
+S3 requires all object names to be valid utf-8. But some
+clients, notably Windows NFS clients, use their own encoding.
+This option re-encodes invalid utf-8 object names into valid
+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.
 .SH FUSE/MOUNT OPTIONS
 .TP
 Most of the generic mount options described in 'man mount' are supported (ro, rw, suid, nosuid, dev, nodev, exec, noexec, atime, noatime, sync async, dirsync).  Filesystems are mounted with '\-onodev,nosuid' by default, which can only be overridden by a privileged user.
diff --git a/src/s3fs_util.cpp b/src/s3fs_util.cpp
index 8c78136..023e1bc 100644
--- a/src/s3fs_util.cpp
+++ b/src/s3fs_util.cpp
@@ -1340,13 +1340,13 @@ void show_help ()
     "        Please use this option when the directory in the bucket is\n"
     "        only \"dir/\" object.\n"
     "\n"
-    "   use_wtf8 - allow encoding of non-utf-8 path information.\n"
+    "   use_wtf8 - support arbitrary file system encoding.\n"
     "        S3 requires all object names to be valid utf-8. But some\n"
     "        clients, notably Windows NFS clients, use their own encoding.\n"
     "        This option re-encodes invalid utf-8 object names into valid\n"
-    "        utf-8 S3 by mapping them into a 'private' codepage of the\n"
-    "        Unicode set. Useful if the file system is being re-exported via\n"
-    "        NFS and used by such clients.\n"
+    "        utf-8 by mapping offending codes into a 'private' codepage of the\n"
+    "        Unicode set.\n"
+    "        Useful on clients not using utf-8 as their file system encoding.\n"
     "\n"
     "   notsup_compat_dir (not support compatibility directory types)\n"
     "        As a default, s3fs supports objects of the directory type as\n"