diff --git a/README.md b/README.md
index 1077e08..ec77981 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,7 @@ and set the PY3 python virtual environment: '. PY3/bin/activate'
 
 3) Finally, go to the footprints project and to the 
 bin.py directory (PATH-TO-PROJECT/FOOTPRINTS/bin.py) and run the code: 
-'python runFootprints.py (XML_mission_file)' (see an example in missions dir)  
+'python runFootprints.py (XML_mission_file)' (see an example in missions dir)
+
+4) Access to SW/Dst data (input data) by DDClient - DDServer communication 
+is forbidden from outside of IRAP. (inet socket connection!!!)
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