@@ -44,7 +44,7 @@ func NewLogsCommand(dockerCli *command.DockerCli) *cobra.Command {

 	flags := cmd.Flags()

 	flags.BoolVarP(&opts.follow, "follow", "f", false, "Follow log output")

-	flags.StringVar(&opts.since, "since", "", "Show logs since timestamp")

+	flags.StringVar(&opts.since, "since", "", "Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)")

 	flags.BoolVarP(&opts.timestamps, "timestamps", "t", false, "Show timestamps")

 	flags.BoolVar(&opts.details, "details", false, "Show extra details provided to logs")

 	flags.StringVar(&opts.tail, "tail", "all", "Number of lines to show from the end of the logs")

@@ -24,8 +24,8 @@ Options:

       --details        Show extra details provided to logs

   -f, --follow         Follow log output

       --help           Print usage

-      --since string   Show logs since timestamp

-      --tail string    Number of lines to show from the end of the logs (default "all")

+      --since string   Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)

+      --tail string    Number of lines to show from the end of the logs (default "all") 

   -t, --timestamps     Show timestamps

 ```