diff --git a/arkindex_worker/worker.py b/arkindex_worker/worker.py
index c2a921915f8ea9039eb18df6edc1a89ded95bc9d..26b8504825d1571e1e1f03a8d827a13db0e7bd0a 100644
--- a/arkindex_worker/worker.py
+++ b/arkindex_worker/worker.py
@@ -141,12 +141,14 @@ class BaseWorker(object):
                 if os.path.isfile(parent_cache_path):
                     parents_cache_paths.append(parent_cache_path)
 
+            # Only one parent cache, we can just copy it into our current task local cache
             if len(parents_cache_paths) == 1:
                 with open(self.cache.path, "rb+") as cache_file, open(
                     parents_cache_paths[0], "rb"
                 ) as parent_cache_file:
                     cache_file.truncate(0)
                     cache_file.write(parent_cache_file.read())
+            # Many parents caches, we have to merge all of them in our current task local cache
             elif len(parents_cache_paths) > 1:
                 self.cache.merge_parent_caches(parents_cache_paths)