Grouped commands help description

command/eval.go

@@ -1,13 +1,32 @@
 package command
 
-import "github.com/mitchellh/cli"
+import (
+	"strings"
+
+	"github.com/mitchellh/cli"
+)
 
 type EvalCommand struct {
 	Meta
 }
 
 func (f *EvalCommand) Help() string {
-	return "This command is accessed by using one of the subcommands below."
+	helpText := `
+Usage: nomad eval <subcommand> [options] [args]
+
+  This command groups subcommands for interacting with evaluations. Evaluations
+  are used to trigger a scheduling event. As such, evaluations are an internal
+  detail but can be useful for debugging placement failures when the cluster
+  does not have the resources to run a given job.
+
+  Examine an evaluations status:
+
+      $ nomad eval status <eval-id>
+
+  Please see the individual subcommand help for detailed usage information.
+`
+
+	return strings.TrimSpace(helpText)
 }
 
 func (f *EvalCommand) Synopsis() string {