diff --git a/README.md b/README.md
index 3b98924..3394de5 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,18 @@
 
 Badges for KIF 47.0 in Dresden.
 
-1. Set desired template/background and CSV-file in badge.tex.
-2. Compile bad.tex with XeLaTeX.
+0. Run the python script list_reorder.py on a CSV-file to duplicate entries and add dummies to get a multiple of 4 badges (since 4 are printed on a page at a time). This has to be done in order to print the badges in duplex:
+```
+python list_reorder.py original.csv output_duplex.csv unused_codes_for_dummies.txt
+```
+
+1. Set desired template/background (line 13, replace Badge_Helfer.pdf) and CSV-file (line 207, replace helfer_badges_duplex.csv) in badge.tex. The CSV-file has to be of the following form (the code has to be exactly 12 digits long):
+```Matthias Stuhlbein,123456789012,TU Dresden
+   Matze,234567890123,TU Dresden
+   Stuhlbein,345678901234,Privat
+   Max,456789012345,Uni uni
+   Moritz,567890123456,TU Dresden
+```
+
+2. Compile badge.tex with XeLaTeX.
 3. Compile druck.tex.