Index search help correction

index.go

@@ -44,7 +44,7 @@ func handleIndexCommand() {
 		cmd := flag.NewFlagSet("index search", flag.ExitOnError)
 		cmd.SetOutput(os.Stdout)
 		cmd.Usage = func() {
-			fmt.Printf("Usage: %s index %s [args] <index>...\n",
+			fmt.Printf("Usage: %s index %s [args] <index> <search term(s)>\n",
 				os.Args[0], subcmd)
 			cmd.PrintDefaults()
 		}