diff --git a/.gitignore b/.gitignore
index 612ddb9..9f95195 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,8 @@
+## general
+*.pyc
+
+## data
+_data/api_keys.py
 angebote_traegerMail_iteration/dict_*.json
 openAI_validate_data/2024-12 gpt-4o-mini/*.csv
-*.pyc
+
diff --git a/README.md b/README.md
index c571348..a9f1863 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,11 @@
 # Data processing script(s)
 
+### PrerequisiriesXX
+In directory `_data` is a file with name `api_keys.py` that holds API keys:
+```GOOGLE_API_KEY = 'api_key_here'
+OPENAI_API_KEY = 'api_key_here'
+... ```
+
 ## angebote_traegerMail_iteration (related to FM)
 ### Input
 This script is related to FileMaker script "OptOut: Mailadressen sammeln - simple Tabelle" that collects data "Name | Angebotsmail | Trägermail". The FM script has the variable $$angeboteMailListe as result -> extract its value into `input.txt`.
diff --git a/_data/api_keys.py b/_data/api_keys.py
deleted file mode 100644
index 41fde71..0000000
--- a/_data/api_keys.py
+++ /dev/null
@@ -1,2 +0,0 @@
-GOOGLE_API_KEY = 'INSERT HERE'
-OPENAI_API_KEY = 'INSERT HERE'
\ No newline at end of file