diff --git a/FilterKeywords.py b/FilterKeywords.py
index 1989a9f..e5f4887 100644
--- a/FilterKeywords.py
+++ b/FilterKeywords.py
@@ -6,8 +6,7 @@ FilterKeywords searches for merger specific keywords
 in an article and counts them.
 '''
 
-# toDo: dict ändern!
-
+from collections import defaultdict
 import re
 
 from nltk.stem.porter import PorterStemmer
@@ -45,8 +44,8 @@ class FilterKeywords:
         # remove duplicates
         keywords = set(keyword_list)
 
-        # counts keywords in article
-        dict_keywords = {}
+        # counts keywords in article (default value: 0)
+        dict_keywords = defaultdict(int)
 
         # search for matchings in dictionary of input article
         for key in dict_input.keys():
@@ -54,10 +53,13 @@ class FilterKeywords:
             for kword in keywords:
                 if re.match(kword, key):
                     # if match, increase value of matching key
-                    ## DORIS: Hier könntest du ein defaultdict verwenden, https://www.accelebrate.com/blog/using-defaultdict-python/ 
                     if str(kword) in dict_keywords:
                         dict_keywords[str(kword)] += dict_input[key]
                     else:
                         dict_keywords[str(kword)] = dict_input[key]
 
-        return dict_keywords
\ No newline at end of file
+        return dict_keywords
+
+if __name__ == '__main__':
+    dict_test={'example':2, 'combined':5, 'sells':3}
+    print(FilterKeywords.search_keywords(dict_test))
\ No newline at end of file