Fix ci-status help

commands/ci_status.go

@@ -13,7 +13,7 @@ var cmdCiStatus = &Command{
 	Usage: "ci-status [COMMIT]",
 	Short: "Show CI status of a commit",
 	Long: `Looks up the SHA for COMMIT in GitHub Status API and displays the latest
-status. Exits with one of:
+status. If no COMMIT is provided, HEAD will be used. Exits with one of:
 
 success (0), error (1), failure (1), pending (2), no status (3)
 `,