diff --git a/readme.txt b/readme.txt
index ec0a774..37a52a4 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,3 +1,8 @@
+------ PLEASE READ! ------
+
 User Input:
 
-Please define all input parameters under input/user_input.py
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+1. Please define all input parameters under input/user_input.py
+
+2. Script "DataRequest.py" needs to be run prior to generate netCDF-datafile for atmospheric data! 
+   Please ensure sufficient disk space (1,25 GB)
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