diff --git a/modules/aeolus/datasource.py b/modules/aeolus/datasource.py
index 1b28b15cf9a961f949cb0ed7e76e606a51b81819..8bbcbe56bbf624df902affc262d7c47fa7ef1076 100644
--- a/modules/aeolus/datasource.py
+++ b/modules/aeolus/datasource.py
@@ -83,7 +83,7 @@ class Files:
         if os.path.isdir(files_path):
             for path in Path(files_path).rglob(pattern):
                 self.flist.append(path)
-        elif fnmatch.fnmatch(os.path.basename(files_path), pattern):
+        elif fnmatch.fnmatch(os.path.basename(files_path), pattern):  # check if this single file matches pattern
             self.flist.append(files_path)
         if len(self.flist) == 0:
             raise GenericException('no matching files found in: ' + files_path + '  matching: ' + pattern)