diff --git a/modules/aeolus/datasource.py b/modules/aeolus/datasource.py
index 128b46ad4c0648a643ef9ec54d21941fe10e56e9..345b9cfbaa4a654ec16136e6ff8ee8e83b056a57 100644
--- a/modules/aeolus/datasource.py
+++ b/modules/aeolus/datasource.py
@@ -151,7 +151,7 @@ class Files:
         """
         :param timestamp: seconds since the epoch.
         :param window: the duration (minutes) of files in this object. Defaults to the constructor time span.
-        :return: the file whose duration contains the timestamp.
+        :return: the file whose start time is closest to timestamp.
         """
         if window is None:
             window = self.span_seconds