diff --git a/Makefile b/Makefile
index cc32dfb..ca3eab7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 export TEXINPUTS := $(shell pwd)//:${TEXINPUTS}
 
-doc: 
+source/avremu.pdf:
 	cd source; latexmk -pdf -shell-escape avremu
 
 test: test-simple
@@ -12,4 +12,24 @@ test-simple: source/simple-testsuite.tex
 test-%: source/test-suite/%.c
 	cd source/test-suite; ./test-suite single $(shell basename $<)
 
-.PHONY: test-simple doc
+avremu.zip: source/avremu.pdf
+	rm -rf avremu avremu.zip
+	mkdir avremu
+	# TeX Directory
+	mkdir -p  avremu/tex/latex/avremu
+	cp tex/latex/avremu/*.tex avremu/tex/latex/avremu
+	cp tex/latex/avremu/*.sty avremu/tex/latex/avremu
+	# Source directory
+	mkdir -p avremu/source/latex/avremu
+	cp -r imgs avremu/source/latex/avremu
+	mkdir -p avremu/source/latex/avremu/test-suite
+	cp source/test-suite/*.c avremu/source/latex/avremu/test-suite
+	cp  source/simple-testsuite.tex avremu/source/latex/avremu/
+	# Documenation directory
+	mkdir -p avremu/doc/latex/avremu
+	cp source/avremu.pdf avremu/doc/latex/avremu
+	zip -r avremu.zip avremu
+	rm -rf avremu
+
+
+.PHONY: test-simple source/avremu.pdf avremu.zip
diff --git a/README.md b/README.md
index 63deaf7..45f6752 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ programming language. TeX can compute anything, that is
 computable. Computeability is a concept from theoretical computer
 science. After visiting a theoretical CS course, you will know that
 there are things that cannot be solved by a machine. Never. Look out
-for the halting machine. So, Turing-complete does not say "It's a
+for the halting problem. So, Turing-complete does not say "It's a
 proper programming language", but more "someone can write a proper
 interpreter for any programming language in it, theoretically".
 
@@ -28,6 +28,8 @@ future, if you start this. But, we can use a normal C compiler to
 compile the C code to some simple platform. Like AVR[4]. Since I have
 other things to do than writing an AVR Emulator in TeX, here it is!
 
+The newest source can be found at https://gitlab.brokenpipe.de/stettberger/avr_tex.
+
 ## You are writing an CPU emulator in TeX, the TYPESETTING system? ##
 
 Yep.
diff --git a/source/avremu.tex b/source/avremu.tex
index 1d7f95b..dd12b23 100644
--- a/source/avremu.tex
+++ b/source/avremu.tex
@@ -4,6 +4,13 @@
 \usepackage{hyperref}
 \usepackage{filecontents}
 \usepackage{tcolorbox}
+\usepackage{ydoc}
+
+\makeatletter
+\def\cmd#1{\cs{\expandafter\cmd@to@cs\string#1}}
+\def\cmd@to@cs#1#2{\char\number`#2\relax}
+\DeclareRobustCommand\cs[1]{\texttt{\char`\\#1}}
+\makeatother
 
 \begin{filecontents*}{hello-world.c}
 #include <avr/io.h>
@@ -22,7 +29,8 @@ main(void)
 
 \title{The \texttt{avremu} Package}
 \author{Christian Dietrich\\
-\url{stettberger@dokucode.de}}
+\url{stettberger@dokucode.de}\\
+\url{https://gitlab.brokenpipe.de/stettberger/avr_tex}}
 
 \begin{document}
 
@@ -42,6 +50,60 @@ UDR='\avrUDR' in \avrinstrcount\ instructions
 UDR='\avrUDR' in \avrinstrcount\ instructions
 \end{tcolorbox}
 
+
+\LaTeX\ is known as a typesetting system. But the underlying \TeX\ system is a powerful macro
+processor. In fact, TeX is a Turing-complete programming language. \TeX\ can compute anything that
+is computable. Computeability is a concept from theoretical computer science. After visiting a
+theoretical computer-science course, you will know that there are things that cannot be solved by a
+machine. Never. Look out for the halting problem. 
+
+This package does contain an \emph{CPU emulator} for the 8-bit microcontroller platform Atmel AVR, more
+precisely it implements the instruction-set architecture of the \texttt{ATmega8}.
+
+\section{Provided Commands}
+
+\DescribeMacro{\avrloadihex}{\meta{filename}}
+Load an Intel HEX formatted image of the flash into the code memory of the AVR
+emulator. Additionally the state of the AVR emulator is set back to zero.
+
+\DescribeMacro{\avrloadc}[\meta{compiler options}]{\meta{filename}}
+Requires \verb|--shell-escape|. Compiles C source code file with \verb|avr-gcc| and the given
+compiler options. The default compiler option set is \verb|-mmcu=atmega8 -Os|. The resulting
+\texttt{.elf} file is transformed to an Intel HEX file and loaded into the code memory of the
+emulator.
+
+\DescribeMacro{\avrrun}
+Run the emulator until a \textbf{break} instruction occurs.
+
+\DescribeMacro{\avrstep}[\meta{steps}=1]
+Run the emulator for N instructions. The default is a single step. The stepping does automatically
+end, if a \textbf{break} instruction is executed.
+
+\DescribeMacro{\avrinstrcount}
+Expands to the number of executed instructions.
+
+\DescribeMacro{\avrsinglestep}
+Starts an interactive single-stepping mode, which was mainly used for implementing the emulator.
+
+\DescribeMacro{\usravremulibrary}{\meta{list of libraryies}}
+
+\subsection{Access to the Serial Console}
+If the program write to the \verb|UDR| IO register, the emulator catched those characters in an
+internal buffer.
+
+\DescribeMacro{\avrUDR}
+Expands to the internal UDR buffer.
+
+\DescribeMacro{\avrUDRclear}
+Clears the internal UDR buffer.
+
+\subsection{Draw Library}
+\DescribeMacro{\useavremulibrary}{avr.draw}
+
+See source/test-suite/mandelbrot.c for more details.
+
+\section{Implementation Details}
+Read the source.
 \end{document}
 
 %%% Local Variables: 
diff --git a/source/simple-testsuite.tex b/source/simple-testsuite.tex
index c41b899..23d851a 100644
--- a/source/simple-testsuite.tex
+++ b/source/simple-testsuite.tex
@@ -1,5 +1,5 @@
 \documentclass{article}
-\usepackage{avremu}
+\usepackage[debug]{avremu}
 
 \begin{document}
 \makeatletter
diff --git a/source/test-suite/HEADER b/source/test-suite/HEADER
index 9755856..2df95b0 100644
--- a/source/test-suite/HEADER
+++ b/source/test-suite/HEADER
@@ -1,7 +1,7 @@
 \documentclass{article}
 \usepackage{graphicx}
 
-\usepackage{avremu}
+\usepackage[debug]{avremu}
 \useavremulibrary{avr.draw}
 
 \errorcontextlines=23