diff --git a/README.md b/README.md
index b2b9fad..c5cd171 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,15 @@ python3 edit_data_form.py
 
 ## Daten eines bestehenden Mitglieds ändern
 
+Eine Nennung des Ordners des Members genügt.
+Dann wird stets die aktuelle json-Datei verwendet.
+
 ```bash
-MEMBER_FILE=<path/to/member/json>
-python3 edit_data_form.py $MEMBER_FILE
+python3 edit_data_form.py <path/to/member/>
+```
+
+Alternativ kann die json-Datei explizit genannt werden:
+
+```bash
+python3 edit_data_form.py <path/to/member/member.json>
 ```
\ No newline at end of file
diff --git a/edit_data_form.py b/edit_data_form.py
index 68ab61a..7c41f17 100755
--- a/edit_data_form.py
+++ b/edit_data_form.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 # encoding: utf-8
 
+import os
 import npyscreen
 import json
 import datetime
@@ -65,9 +66,24 @@ class FormApp(npyscreen.NPSAppManaged):
 def main(*_args):
     if len(sys.argv) > 1:
         file_path = pathlib.Path(sys.argv[1])
-        if not file_path.exists():
-            print("Trying to open nonexistent file. Aborting.")
+
+        if(sys.argv[1].endswith(".json")):
+            # json file as argument
+
+            if not file_path.exists():
+                print("Trying to open nonexistent file. Aborting.")
+                sys.exit(0)
+
+        elif file_path.is_dir():
+            # we want the latest json file in given folder
+            filesList = [f for f in os.listdir(file_path) if os.path.isfile(os.path.join(file_path, f)) and f.endswith(".json")]
+            filesList.sort()
+            file_path = os.path.join(file_path, filesList[-1])
+
+        else:
+            print("Please enter a valid json file or the directory containing the json file!")
             sys.exit(0)
+
     else:
         file_path = pathlib.Path(pathlib.Path(__file__).absolute().parent, 'example.json')