diff --git a/lib/src/reflector_null.dart b/lib/src/reflector_null.dart
index ce63685..3857d86 100644
--- a/lib/src/reflector_null.dart
+++ b/lib/src/reflector_null.dart
@@ -20,6 +20,6 @@ class NullReflector extends TypeReflector {
 
 class NullReflectorError extends BaseError {
   NullReflectorError()
-      : super("Module.DEFAULT_REFLECTOR not initialized for dependency injection."
+      : super("Module.DEFAULT_REFLECTOR not initialized for dependency injection. "
               "http://goo.gl/XFXx9G");
 }