diff --git a/src/caosadvancedtools/suppressKnown.py b/src/caosadvancedtools/suppressKnown.py
index 61b016052a89db3d157f5f6e8d0562f88ee22131..c15f0e06fa7d126937497aeb877dd5d2991b6ff7 100644
--- a/src/caosadvancedtools/suppressKnown.py
+++ b/src/caosadvancedtools/suppressKnown.py
@@ -71,6 +71,16 @@ class SuppressKnown(logging.Filter):
         return sha256((txt+str(identifier)).encode("utf-8")).hexdigest()
 
     def filter(self, record):
+        """
+        Return whether the record shall be logged.
+
+
+        If either identifier of category is missing 1 is returned (logging
+        enabled). If the record has both attributes, it is checked whether the
+        combination was shown before (was_tagged). If so 0 is returned.
+        Otherwise the combination is saved and 1 is returned
+        """
+
         if not hasattr(record, "identifier"):
             return 1
 
diff --git a/src/caosadvancedtools/table_importer.py b/src/caosadvancedtools/table_importer.py
index 6b9be807a5a34806139023d185ac3fb01e33e10f..1abeba95db6eab8c8e30945db2a94bb894bee00d 100755
--- a/src/caosadvancedtools/table_importer.py
+++ b/src/caosadvancedtools/table_importer.py
@@ -40,7 +40,7 @@ from .suppressKnown import SuppressKnown
 logger = logging.getLogger(__name__)
 
 
-def name_converter(name):
+def assure_name_format(name):
     """
     checks whether a string can be interpreted as 'LastName, FirstName'
     """
@@ -87,6 +87,9 @@ class XLS_Importer(object):
                     necessary.
         obligatory_columns: list of column names, optional
                             each listed column must not have missing values
+        unique_columns : list of column names that in
+                            combination must be unique; i.e. each row has a
+                            unique combination of values in those columns.
         """
         self.sup = SuppressKnown()
         self.required_columns = list(converters.keys())