diff --git a/modules/aeolus/datasource.py b/modules/aeolus/datasource.py
index 7be569e9cbadd39df59fe2ac4579e6266909a095..1f077bf962e1e7c7ebeb18915b8e700d0a77c74f 100644
--- a/modules/aeolus/datasource.py
+++ b/modules/aeolus/datasource.py
@@ -111,6 +111,9 @@ class Files:
         self.number_of_files = len(self.flist)
 
     def get_number_of_files(self):
+        """
+        :return: The number of files self managers
+        """
         return self.number_of_files
 
     def get_datetime(self, pathname):