diff --git a/components/cli/command/container/update.go b/components/cli/command/container/update.go
index 5bacc9be75..75765856c5 100644
--- a/components/cli/command/container/update.go
+++ b/components/cli/command/container/update.go
@@ -50,7 +50,7 @@ func NewUpdateCommand(dockerCli *command.DockerCli) *cobra.Command {
 	}
 
 	flags := cmd.Flags()
-	flags.Uint16Var(&opts.blkioWeight, "blkio-weight", 0, "Block IO (relative weight), between 10 and 1000")
+	flags.Uint16Var(&opts.blkioWeight, "blkio-weight", 0, "Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)")
 	flags.Int64Var(&opts.cpuPeriod, "cpu-period", 0, "Limit CPU CFS (Completely Fair Scheduler) period")
 	flags.Int64Var(&opts.cpuQuota, "cpu-quota", 0, "Limit CPU CFS (Completely Fair Scheduler) quota")
 	flags.Int64Var(&opts.cpuRealtimePeriod, "cpu-rt-period", 0, "Limit the CPU real-time period in microseconds")