diff --git a/lib/cartodb/api/map/clustered-features-layergroup-controller.js b/lib/cartodb/api/map/clustered-features-layergroup-controller.js
index 48e56b32..5c17c5b1 100644
--- a/lib/cartodb/api/map/clustered-features-layergroup-controller.js
+++ b/lib/cartodb/api/map/clustered-features-layergroup-controller.js
@@ -42,6 +42,7 @@ module.exports = class AggregatedFeaturesLayergroupController {
             credentials(),
             authorize(this.authBackend),
             dbConnSetup(this.pgConnection),
+            // TODO: create its rate limit
             rateLimit(this.userLimitsBackend, RATE_LIMIT_ENDPOINTS_GROUPS.ATTRIBUTES),
             cleanUpQueryParams([ 'aggregation' ]),
             createMapStoreMapConfigProvider(
diff --git a/lib/cartodb/backends/cluster.js b/lib/cartodb/backends/cluster.js
index c90f176d..c9776eba 100644
--- a/lib/cartodb/backends/cluster.js
+++ b/lib/cartodb/backends/cluster.js
@@ -6,6 +6,7 @@ const debug = require('debug')('backend:cluster');
 const AggregationMapConfig = require('../models/aggregation/aggregation-mapconfig');
 
 module.exports = class ClusterBackend {
+    // TODO: reduce complexity
     // jshint maxcomplexity: 17
     getClusterFeatures (mapConfigProvider, params, callback) {
         mapConfigProvider.getMapConfig((err, _mapConfig) => {