diff --git a/README.md b/README.md
index 9d2a0a6..9683ecc 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,4 @@
-15.09.2016 - Fix WinMove for Windows 10.
-------------------------
-
-GridMove
+GridMove (unstable, customized)
 ========
 
 GridMove is a Windows program that aims at making windows management easier. It helps you with this task by defining a visual grid on your desktop, to which you can easily snap windows. It is built with [AutoHotkey](http://www.autohotkey.com "AutoHotKey"), a scripting language for desktop automation for Windows.
@@ -20,3 +17,27 @@ Source code organization
 * Aero\_lib.ahk - Library for handling Aero look
 
 This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
+
+## Differences from original:
+Block system. The screen(s) are divided up into a given blocksize. E.g. in your `.grid` file:
+```
+[Groups]
+
+  NumberOfGroups = 36
+  Blocksize = 7
+```
+
+Blocks are used M`X`B`Y`, where `X` is the monitor number and `Y` is the block number. Se example below
+
+Customizable numberings (doesn't have to be the group number):
+```
+[25]
+  ShortCutNum   = 4
+  GridTop       = [Monitor2Top]
+  GridBottom    = [Monitor2Bottom]
+  GridLeft      = [M2B1]
+  GridRight     = [M2B2]
+
+  ShowGrid      = 0
+```
+The above has shortcut number `4` and not `25`.
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