diff --git a/README.md b/README.md
index b38976f2bcd3b5fd7ddc44ec2e7dc48baec8dfe5..fb79b34d76e05397c16aeb355e66bc2a2d963c6c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # ChIA-PET network
 
 ## Description
+
+##Prerequisites
+PmagicGEO - https://gitbio.ens-lyon.fr/LBMC/regards/pmagicgeo - a script that allows to obtain metadata associated to a GSE or a GSM.