diff --git a/README.md b/README.md
index 00babce..ea524b8 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ The map is generated in chunks through many invocations of `minetestmapper` inst
 You will need:
 
     -bash
+    -imagemagick
     -a web server of some sort
     -minetestmapper
 
@@ -27,5 +28,5 @@ The `dimension` number specifies the width and height of the map that should be
 After mapping has finished, you can open the `www/map.html` file. If you want to publish your results, you can either symlink the `www` directory into your `/var/www` directory, or copy it. Due to usage of relative symlinks, you should use `rsync -L`, so that the copied directory doesn't contain symlinks.
 
 ##License
-All contributions of est31 published in this repo are MIT licensed.
- 
+Copyright (c) 2015 est31, License: MIT.
+Parts base on unilicensed script from [LibertyLand](http://www.ayntest.net/pages/liberty-land-map.html) minetest server, [github here](https://github.com/ayntest/ayntest.github.io).
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