diff --git a/topologie/topology.py b/topologie/topology.py
index c94cfa3..ac66567 100755
--- a/topologie/topology.py
+++ b/topologie/topology.py
@@ -57,6 +57,9 @@ DEV3_GWF3_IP = '192.168.3.3' #name = dev3gwf3
 
 '''
 TOPOLOGY OVERVIEW
+Necessary docker images: config:topo ; server:topo ; gateway:topo ; device:topo
+
+
                                                     ++++++++
                                                     + dev1 +
                                                     ++++++++