diff --git a/cmd/serve/sftp/sftp.go b/cmd/serve/sftp/sftp.go
index 1a7b7717c..46c485d75 100644
--- a/cmd/serve/sftp/sftp.go
+++ b/cmd/serve/sftp/sftp.go
@@ -48,7 +48,7 @@ func AddFlags(flagSet *pflag.FlagSet, Opt *Options) {
 	flags.StringVarP(flagSet, &Opt.User, "user", "", Opt.User, "User name for authentication")
 	flags.StringVarP(flagSet, &Opt.Pass, "pass", "", Opt.Pass, "Password for authentication")
 	flags.BoolVarP(flagSet, &Opt.NoAuth, "no-auth", "", Opt.NoAuth, "Allow connections with no authentication if set")
-	flags.BoolVarP(flagSet, &Opt.Stdio, "stdio", "", Opt.Stdio, "Run an sftp server on run stdin/stdout")
+	flags.BoolVarP(flagSet, &Opt.Stdio, "stdio", "", Opt.Stdio, "Run an sftp server on stdin/stdout")
 }
 
 func init() {
@@ -61,11 +61,19 @@ func init() {
 var Command = &cobra.Command{
 	Use:   "sftp remote:path",
 	Short: `Serve the remote over SFTP.`,
-	Long: `Run a SFTP server to serve a remote over SFTP. This can be used
-with an SFTP client or you can make a remote of type sftp to use with it.
+	Long: `Run an SFTP server to serve a remote over SFTP. This can be used
+with an SFTP client or you can make a remote of type [sftp](/sftp) to use with it.
 
-You can use the filter flags (e.g. ` + "`--include`, `--exclude`" + `) to control what
-is served.
+You can use the [filter](/filtering) flags (e.g. ` + "`--include`, `--exclude`" + `)
+to control what is served.
+
+The server will respond to a small number of shell commands, mainly
+md5sum, sha1sum and df, which enable it to provide support for checksums
+and the about feature when accessed from an sftp remote.
+
+Note that this server uses fixed 32 KiB packet size, which means you must not
+configure the client to use any other values, e.g. with the
+[chunk_size](/sftp/#sftp-chunk-size) option on an sftp remote.
 
 The server will log errors.  Use ` + "`-v`" + ` to see access logs.
 
@@ -78,11 +86,6 @@ You must provide some means of authentication, either with
 ` + "`--auth-proxy`" + `, or set the ` + "`--no-auth`" + ` flag for no
 authentication when logging in.
 
-Note that this also implements a small number of shell commands so
-that it can provide md5sum/sha1sum/df information for the rclone sftp
-backend.  This means that is can support SHA1SUMs, MD5SUMs and the
-about command when paired with the rclone sftp backend.
-
 If you don't supply a host ` + "`--key`" + ` then rclone will generate rsa, ecdsa
 and ed25519 variants, and cache them for later use in rclone's cache
 directory (see ` + "`rclone help flags cache-dir`" + `) in the "serve-sftp"