diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index 51147cf58cd186b27207e319f5b00c6b8b2b5f86..415f9b0be4f0022e33ab09a5487d6b639c12a306 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -373,13 +373,14 @@ for me it is an ok workaround,
 
 Use e.g.:
 - Linux 'retext' as markdown editor and previewer. 
-- https://typora.io
+- https://typora.io, mooi maar waarscijnlijk te geavanceerd en daardoor niet
+  compatible met andere viewers
+- Python3 --> import mdutil  # markdown writer en reader
 
-Markdown is not well 
-defined, so it is not always sure that the text will appear as expected in
-each viewer. For example retext and gitlab viewer differ. Therefore it is
-important to keep the markdown simple and to accept that readable text is good
-enough, rather than to strive for a specific layout.
+Markdown is not well defined, so it is not always sure that the text will 
+appear as expected in each viewer. For example retext and gitlab viewer differ.
+Therefore it is important to keep the markdown simple and to accept that
+readable text is good enough, rather than to strive for a specific layout.
 
 Text will wrap.
 
@@ -722,20 +723,36 @@ Start --> Administration --> Synaptic package manager
 > sudo pip install numpy      # to run Python2 library installer as root
 > sudo pip3 install numpy     # to run Python3 library installer as root
 
+> sudo apt-get install pip    # to install Python2 library installer
+
+# ARGS doc gen
 > sudo pip3 install --upgrade setuptools
+> sudo pip3 install --upgrade pyyaml
+
 > sudo pip3 install pylatex
+
+> sudo apt-get update -y
+> sudo apt-get install -y latexmk
+
 > sudo apt-get install texlive-latex-base
 > sudo apt-get install texlive-fonts-recommended
 > sudo apt-get install texlive-fonts-extra
 > sudo apt-get install texlive-latex-extra
 
-> sudo apt-get install pip    # to install Python2 library installer
+> sudo apt-get install lmodern # want log gaf aan dat lmodern.sty miste, nu wel pdf gegenereerd
+
+# Markdown
+> sudo pip3 install markdown  # zit al in Python3, maar kan alleen md --> html
+> sudo pip3 install mdutils   # https://pypi.org/project/mdutils/ # kan md genereren
+
 
+# Ethernet
 > ifconfig
 
-apt-get upgrade
-apt-get dist-upgrade
-apt remove
+# Henk Vosmeier
+sudo apt-get upgrade
+sudo apt-get dist-upgrade
+sudo apt remove
 
 # primary group
 # supplementary groups