diff --git a/cdc.d b/cdc.d
index d222afd..bce1388 100755
--- a/cdc.d
+++ b/cdc.d
@@ -234,7 +234,8 @@ void main(string[] args)
             case "all":      build("debug", "release", "unittest"); break;
             default:
                 writeln("unknown build target: ", target);
-                writeln("available targets: 'debug', 'release', 'profile', 'unittest', 'all'");
+                writeln("available targets: 'debug', 'release', 'profile', "
+                        "'all', 'unittest', 'tar.gz', 'tar.xz', 'zip'");
         }
     }