diff --git a/README.txt b/README.txt
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+What is this?
+=============
+
+This is a small python library for generating SVG drawings used for
+cutting out boxes or other structures from plywood using a laser cutter.
+
+While there are a couple of other box generators they are all very
+limited in what they can do. This library aims for supporting
+complicated shapes while offering easy way to do simple things. To
+achieve this there are several levels of abstactions. 
+
+Basic Concepts
+==============
+
+There is basically only one class that takes care of everything. You
+are supposed to sub class it and implement the render() method
+(actually just any method that does anything). This Boxes class keeps
+a cairo canvas object (self.ctx) that all drawing is made on. In
+addition it keeps a couple of global settings used for various drawing
+operations. See the __init__ method for the details.
+
+Building blocks and coordinates
+-------------------------------
+
+To avoid too much coordinate calculations the coordinate system is
+continuously moved to the current point. The most basic functions just
+do drawings relative to the current coordinate system - withou
+changing the coordinate system. Those are found in the Builing block section.
+
+Turtle graphics commands
+------------------------
+
+These start at the current positions and move the coordinate system to
+their end. It is assumed that you are always drawing into the
+direction of the x axis, with the inside of the part being above the
+line. You need to turn counter clockwise (mathematically positive) to
+get a closed shape. These are typically some sort of edges.
+
+Finger joints
+.............
+
+Finger joints are a smple way of joining two sheets of plywood. They
+wor best at an 90° angle. There are two different sides matching each
+other. As a third alternative there are holes that the fingers of one
+sheet can plug into. This allows stable T connections especially
+useful for inner walls.
+
+Dovetail joints
+...............
+
+Dovetails joints can only be used to join two pieces flatly. This
+limits their use to closing some round form created with flex areas or
+for joining several parts to a bigger one. For this use case they are
+much stronger than simple finger joints and can also bare pulling forces.
+
+
+Whole parts
+===========
+
+A couple of command can create whole parts like walls. Typically the
+sizes given are the inner dimmensions not including additional space
+needed for burn compensation or joints.
+
+
+Callback parameter
+..................
+
+The callback parameter can take on of the following forms:
+
+ * A function (or bound method) that expects one parameter: the number
+   of the side the callback is currently called for. 
+ * A dict with some of the numbers of the sides as keys and functions
+   without parameters as values.
+ * A list of functions without parameters. The list may contain None
+   as place holder and be shorter than the number of sides. 
+
+The callback functions are called with the side of the part at the
+positive x and y axis. If the edge uses up space this space is below
+the x axis. You do not have to restore the coordinate settings in the
+callback.
+
+Instead of functions it can be handy to use a lambda expression
+calling the one building block funtion you need (e.g. fingerHolesAt).
+
+Edge description
+................
+
+Some part building functions take a edges param or have other params
+describing some edges. These descriptions are one or several character
+strings. With the following meanings: 
+
+ e : straight edge
+ E : as above but extended outside by one thickness
+ f, F : finger joints
+ h : edge with holes for finger joints
+ d, D : dove tail joints
diff --git a/TODO.txt b/TODO.txt
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+ * Make output file configurable
+ * Make outer edge continuous even if other parts are drawn intermediately.
+ * Fix burn compensation for building blocks (especially fingerHolesAt)
+ * Fix hexHoles* (leftoover, grow to space, ...)
+ * Add hexHolesCircle and may be other shapes
+ * Try out box with fully mixed fF edges and check if all corners work properly
+ * finish lamp
+ * make fingerJointSettings depending on thickness?
+ * Make settings nicer
+  * offer a collection of different settings