diff --git a/epkcompiler/CompilePackage.jar b/epkcompiler/CompilePackage.jar
new file mode 100644
index 0000000..f38365c
Binary files /dev/null and b/epkcompiler/CompilePackage.jar differ
diff --git a/epkcompiler/readme.txt b/epkcompiler/readme.txt
new file mode 100644
index 0000000..02f572c
--- /dev/null
+++ b/epkcompiler/readme.txt
@@ -0,0 +1,7 @@
+Use this tool like this:
+
+java -jar CompilePackage.jar <source directory> <output file>
+
+To recompile the assets.epk file found in /javascript, make your changes to the game's resources in /lwjgl-rundir/resources and then run this command within this /epkcompiler directory:
+
+java -jar CompilePackage.jar "../lwjgl-rundir/resources" "../javascript/assets.epk"
\ No newline at end of file
diff --git a/epkcompiler/src/CompilePackage.java b/epkcompiler/src/CompilePackage.java
index 35ddb37..2944ce1 100644
--- a/epkcompiler/src/CompilePackage.java
+++ b/epkcompiler/src/CompilePackage.java
@@ -18,6 +18,10 @@ public class CompilePackage {
 	private static ArrayList<File> files = new ArrayList();
 	
 	public static void main(String[] args) throws IOException, NoSuchAlgorithmException {
+		if(args.length != 2) {
+			System.out.print("Usage: java -jar CompilePackage.jar <input directory> <output file>");
+			return;
+		}
 		File root = new File(args[0]);
 		listDirectory(root);
 		ByteArrayOutputStream osb = new ByteArrayOutputStream();
@@ -47,7 +51,7 @@ public class CompilePackage {
 		os.writeUTF(" end");
 		os.flush();
 		os.close();
-		FileOutputStream out = new FileOutputStream(new File("out.epk"));
+		FileOutputStream out = new FileOutputStream(new File(args[1]));
 		out.write(osb.toByteArray());
 		out.close();
 	}