diff --git a/lib/src/Simulation.dart b/lib/src/Simulation.dart
index 8cc04ef..2f167a3 100644
--- a/lib/src/Simulation.dart
+++ b/lib/src/Simulation.dart
@@ -2,7 +2,7 @@ import 'dart:html' as html;
 import 'dart:math' as math;
 
 import 'package:rules_of_living/src/Grid.dart';
-import 'package:rules_of_living/src/RuleSet.dart';
+import 'package:rules_of_living/src/rules/RuleSet.dart';
 
 enum CellPattern { SpaceShip, Blinker }
 
diff --git a/lib/src/RuleSet.dart b/lib/src/rules/RuleSet.dart
similarity index 100%
rename from lib/src/RuleSet.dart
rename to lib/src/rules/RuleSet.dart