diff --git a/pandaharvester/harvesterworkermaker/simple_bf_es_worker_maker.py b/pandaharvester/harvesterworkermaker/simple_bf_es_worker_maker.py
index 7d4d0270..09382f6b 100644
--- a/pandaharvester/harvesterworkermaker/simple_bf_es_worker_maker.py
+++ b/pandaharvester/harvesterworkermaker/simple_bf_es_worker_maker.py
@@ -16,6 +16,7 @@
 
 
 class SimpleBackfillESWorkerMaker(BaseWorkerMaker):
+    """Worker maker plugin for simple backfill event service workers."""
     # constructor
     def __init__(self, **kwarg):
         self.jobAttributesToUse = ["nCore", "minRamCount", "maxDiskCount", "maxWalltime"]