diff --git a/cmd/drone-helm/main.go b/cmd/drone-helm/main.go
index 43d2e30..cf0b0e6 100644
--- a/cmd/drone-helm/main.go
+++ b/cmd/drone-helm/main.go
@@ -27,7 +27,7 @@ func main() {
 
 	// Expect the plan to go off the rails
 	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
+		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
 		// Throw away the plan
 		os.Exit(1)
 	}
diff --git a/internal/helm/plan.go b/internal/helm/plan.go
index 0a20969..ebd4774 100644
--- a/internal/helm/plan.go
+++ b/internal/helm/plan.go
@@ -74,7 +74,7 @@ func determineSteps(cfg Config) *func(Config) []Step {
 		case "delete":
 			return &uninstall
 		default:
-			panic("not implemented")
+			return &help
 		}
 	}
 }
@@ -140,7 +140,9 @@ var lint = func(cfg Config) []Step {
 }
 
 var help = func(cfg Config) []Step {
-	help := &run.Help{}
+	help := &run.Help{
+		HelmCommand: cfg.Command,
+	}
 	return []Step{help}
 }
 
diff --git a/internal/run/help.go b/internal/run/help.go
index 8597815..f2d6c59 100644
--- a/internal/run/help.go
+++ b/internal/run/help.go
@@ -6,12 +6,20 @@ import (
 
 // Help is a step in a helm Plan that calls `helm help`.
 type Help struct {
-	cmd cmd
+	HelmCommand string
+	cmd         cmd
 }
 
 // Execute executes the `helm help` command.
-func (h *Help) Execute(_ Config) error {
-	return h.cmd.Run()
+func (h *Help) Execute(cfg Config) error {
+	if err := h.cmd.Run(); err != nil {
+		return fmt.Errorf("while running '%s': %w", h.cmd.String(), err)
+	}
+
+	if h.HelmCommand == "help" {
+		return nil
+	}
+	return fmt.Errorf("unknown command '%s'", h.HelmCommand)
 }
 
 // Prepare gets the Help ready to execute.
diff --git a/internal/run/help_test.go b/internal/run/help_test.go
index 1824578..19c49d2 100644
--- a/internal/run/help_test.go
+++ b/internal/run/help_test.go
@@ -38,9 +38,6 @@ func (suite *HelpTestSuite) TestPrepare() {
 		Stdout(&stdout)
 	mCmd.EXPECT().
 		Stderr(&stderr)
-	mCmd.EXPECT().
-		Run().
-		Times(1)
 
 	cfg := Config{
 		Stdout: &stdout,
@@ -49,8 +46,32 @@ func (suite *HelpTestSuite) TestPrepare() {
 
 	h := Help{}
 	err := h.Prepare(cfg)
-	suite.Require().Nil(err)
-	h.Execute(cfg)
+	suite.NoError(err)
+}
+
+func (suite *HelpTestSuite) TestExecute() {
+	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
+	mCmd := NewMockcmd(ctrl)
+	originalCommand := command
+	command = func(_ string, _ ...string) cmd {
+		return mCmd
+	}
+	defer func() { command = originalCommand }()
+
+	mCmd.EXPECT().
+		Run().
+		Times(2)
+
+	cfg := Config{}
+	help := Help{
+		HelmCommand: "help",
+		cmd:         mCmd,
+	}
+	suite.NoError(help.Execute(cfg))
+
+	help.HelmCommand = "get down on friday"
+	suite.EqualError(help.Execute(cfg), "unknown command 'get down on friday'")
 }
 
 func (suite *HelpTestSuite) TestPrepareDebugFlag() {