diff --git a/bookwyrm/thumbnail_generation.py b/bookwyrm/thumbnail_generation.py
index fb9b9c38..1596e6ab 100644
--- a/bookwyrm/thumbnail_generation.py
+++ b/bookwyrm/thumbnail_generation.py
@@ -1,14 +1,18 @@
+"""thumbnail generation strategy for django-imagekit"""
 class Strategy:
     """
     A strategy that generates the image on source saved (Optimistic),
     but also on demand, for old images (JustInTime).
     """
 
-    def on_source_saved(self, file):
+    def on_source_saved(self, file):  # pylint: disable=no-self-use
+        """What happens on source saved"""
         file.generate()
 
-    def on_existence_required(self, file):
+    def on_existence_required(self, file):  # pylint: disable=no-self-use
+        """What happens on existence required"""
         file.generate()
 
-    def on_content_required(self, file):
+    def on_content_required(self, file):  # pylint: disable=no-self-use
+        """What happens on content required"""
         file.generate()