Grouped commands help description

command/node.go

@@ -1,13 +1,41 @@
 package command
 
-import "github.com/mitchellh/cli"
+import (
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
 
 type NodeCommand struct {
 	Meta
 }
 
 func (f *NodeCommand) Help() string {
-	return "This command is accessed by using one of the subcommands below."
+	helpText := `
+Usage: nomad nomad <subcommand> [options] [args]
+
+  This command groups subcommands for interacting with nodes. Nodes in Nomad are
+  agent's that can run submitted workloads. This command can be used to examine
+  nodes and operate on nodes, such as draining workloads off of them.
+
+  Examine the status of a node:
+
+      $ nomad node status <node-id>
+
+  Mark a node as ineligible for running workloads. This is useful when the node
+  is expected to be removed or upgraded so new allocations aren't placed on it:
+
+      $ nomad node eligibility -disabled <node-id>
+
+  Mark a node to be drained, allowing batch jobs four hours to finished before
+  forcing them off the node:
+
+      $ nomad node drain -enable -deadline 4h <node-id>
+
+  Please see the individual subcommand help for detailed usage information.
+`
+
+	return strings.TrimSpace(helpText)
 }
 
 func (f *NodeCommand) Synopsis() string {