diff --git a/src/main/java/ch/fritteli/labyrinth/generator/model/Labyrinth.java b/src/main/java/ch/fritteli/labyrinth/generator/model/Labyrinth.java
index f358f11..03b0e99 100644
--- a/src/main/java/ch/fritteli/labyrinth/generator/model/Labyrinth.java
+++ b/src/main/java/ch/fritteli/labyrinth/generator/model/Labyrinth.java
@@ -27,8 +27,8 @@ public class Labyrinth {
     }
 
     public Labyrinth(final int width, final int height, final long randomSeed) {
-        if (width <= 0 || height <= 0) {
-            throw new IllegalArgumentException("widht and height must be >=1");
+        if (width <= 1 || height <= 1) {
+            throw new IllegalArgumentException("width and height must be >1");
         }
         this.width = width;
         this.height = height;
diff --git a/src/main/main.iml b/src/main/main.iml
new file mode 100644
index 0000000..908ad4f
--- /dev/null
+++ b/src/main/main.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/test/test.iml b/src/test/test.iml
new file mode 100644
index 0000000..a0e49a3
--- /dev/null
+++ b/src/test/test.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file