diff --git a/README.md b/README.md
index 02442b3..18ec2bd 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,4 @@
-Simply game-helper for Dungeonslayers, written in HTML5 and JS
\ No newline at end of file
+Simply game-helper for Dungeonslayers, written in HTML5 and JS.
+
+All links are given from src-root, which makes it possible to run everything with some basic
+HTTP-Server from this directory (i.e. 'python -m SimpleHTTPServer' or 'python -m http.server')
\ No newline at end of file
diff --git a/src/jsds_crafty.js b/src/jsds_crafty.js
index 0ca7863..f73c788 100644
--- a/src/jsds_crafty.js
+++ b/src/jsds_crafty.js
@@ -77,7 +77,8 @@
 				   (this.hit("coll")[0].overlap) );
 			}
 		    });
-		
+		calc_center();
+
 		/* Mouse-actions: 
 		 * left click: select creature, save old position, make only this creature
 		 * controllable by mouse, write output info
@@ -108,6 +109,10 @@
 		});
 		
 		return this;
+	    },
+	    calc_center: function() {
+		this.cx = this.x + (this.w / 2);
+		this.cy = this.y + (this.h / 2);
 	    }
 	}
     );