--- a/doc/compiler.rst	Sun Dec 01 18:37:23 2013 +0100
+++ b/doc/compiler.rst	Tue Dec 03 18:00:22 2013 +0100
@@ -4,17 +4,11 @@
 ========
 
 This chapter describes the design of the compiler.
-
-
-Overview
---------
-
 The compiler consists a frontend, mid-end and back-end. The frontend deals with
 source file parsing and semantics checking. The mid-end performs optimizations.
 This is optional. The back-end generates machine code. The front-end produces
 intermediate code. This is a simple representation of the source. The back-end
-can accept this kind of representation. This way the compiler is portable and
-a front end can be constructed without having to do the rest.
+can accept this kind of representation.
 
 .. graphviz::
   
@@ -38,6 +32,7 @@
 
 IR-code
 -------
+
 The intermediate representation (IR) of a program de-couples the front end
 from the backend of the compiler.
 
@@ -53,6 +48,7 @@
 .. graphviz::
   
    digraph c3 {
+   rankdir="LR"
    1 [label="source text"]
    10 [label="lexer" ]
    20 [label="parser" ]