diff --git a/backend/src/landmarks/landmarks_manager.py b/backend/src/landmarks/landmarks_manager.py
index 719153d..40dae0e 100644
--- a/backend/src/landmarks/landmarks_manager.py
+++ b/backend/src/landmarks/landmarks_manager.py
@@ -187,6 +187,7 @@ class LandmarkManager:
 
         # caution, when applying a list of selectors, overpass will search for elements that match ALL selectors simultaneously
         # we need to split the selectors into separate queries and merge the results
+        # TODO: this can be multi-threaded once the Overpass rate-limit is not a problem anymore
         for sel in dict_to_selector_list(amenity_selector):
             # self.logger.debug(f"Current selector: {sel}")