diff --git a/doc/man/s3fs.1 b/doc/man/s3fs.1
index 9d41c82..19f42c2 100644
--- a/doc/man/s3fs.1
+++ b/doc/man/s3fs.1
@@ -5,6 +5,8 @@ S3FS \- FUSE-based file system backed by Amazon S3
 .SS mounting
 .TP
 \fBs3fs bucket[:/path] mountpoint \fP [options]
+.TP
+\fBs3fs mountpoint \fP [options(must specify bucket= option)]
 .SS unmounting
 .TP
 \fBumount mountpoint
@@ -48,6 +50,9 @@ FUSE singlethreaded option (disables multi-threaded operation)
 All s3fs options must given in the form where "opt" is:
  <option_name>=<option_value>
 .TP
+\fB\-o\fR bucket
+if it is not specified bucket name(and path) in command line, must specify this option after \-o option for bucket name.
+.TP
 \fB\-o\fR default_acl (default="private")
 the default canned acl to apply to all written S3 objects, e.g., "public-read".
 Any created files will have this canned acl.
diff --git a/src/s3fs.cpp b/src/s3fs.cpp
index 6c571ab..194acee 100644
--- a/src/s3fs.cpp
+++ b/src/s3fs.cpp
@@ -178,6 +178,7 @@ static int check_passwd_file_perms(void);
 static int read_passwd_file(void);
 static int get_access_keys(void);
 static int set_moutpoint_attribute(struct stat& mpst);
+static int set_bucket(const char* arg);
 static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_args* outargs);
 
 // fuse interface functions
diff --git a/src/s3fs_util.cpp b/src/s3fs_util.cpp
index 56ac6e2..b50d937 100644
--- a/src/s3fs_util.cpp
+++ b/src/s3fs_util.cpp
@@ -905,6 +905,17 @@ void show_help (void)
     "\n"
     "Mount an Amazon S3 bucket as a file system.\n"
     "\n"
+    "Usage:\n"
+    "   mounting\n"
+    "     s3fs bucket[:/path] mountpoint [options]\n"
+    "     s3fs mountpoint [options(must specify bucket= option)]\n"
+    "\n"
+    "   umounting\n"
+    "     umount mountpoint\n"
+    "\n"
+    "   utility mode (remove interrupted multipart uploading objects)\n"
+    "     s3fs -u bucket\n"
+    "\n"
     "   General forms for s3fs and FUSE/mount options:\n"
     "      -o opt[,opt...]\n"
     "      -o opt [-o opt] ...\n"
@@ -915,10 +926,14 @@ void show_help (void)
     "\n"
     "             <option_name>=<option_value>\n"
     "\n"
+    "   bucket\n"
+    "      - if it is not specified bucket name(and path) in command line,\n"
+    "        must specify this option after -o option for bucket name.\n"
+    "\n"
     "   default_acl (default=\"private\")\n"
-    "     - the default canned acl to apply to all written s3 objects\n"
-    "          see http://aws.amazon.com/documentation/s3/ for the \n"
-    "          full list of canned acls\n"
+    "      - the default canned acl to apply to all written s3 objects\n"
+    "        see http://aws.amazon.com/documentation/s3/ for the \n"
+    "        full list of canned acls\n"
     "\n"
     "   retries (default=\"2\")\n"
     "      - number of times to retry a failed s3 transaction\n"