diff --git a/js/spaceinvaders-utils.js b/js/spaceinvaders-utils.js
deleted file mode 100644
index 8ef3202..0000000
--- a/js/spaceinvaders-utils.js
+++ /dev/null
@@ -1,12 +0,0 @@
-function getAliensMidHeight() {
-	var higherAlien = Math.max.apply( null, 
-		$(".alien").map(function() {
-			return $(this).y();
-		}).get() ),
-		lowerAlien = Math.min.apply( null, 
-		$(".alien").map(function() {
-			return $(this).y();
-		}).get() );
-		
-	return (higherAlien + lowerAlien) / 2;
-}
diff --git a/js/tools.js b/js/tools.js
index 1776d24..68e8763 100644
--- a/js/tools.js
+++ b/js/tools.js
@@ -67,3 +67,17 @@ function angle(vector1, vector2) {
 		
 	return sign * alpha;
 }
+
+
+function getAliensMidHeight() {
+	var higherAlien = Math.max.apply( null, 
+		$(".alien").map(function() {
+			return $(this).y();
+		}).get() ),
+		lowerAlien = Math.min.apply( null, 
+		$(".alien").map(function() {
+			return $(this).y();
+		}).get() );
+		
+	return (higherAlien + lowerAlien) / 2;
+}
\ No newline at end of file