diff --git a/app/models/filter.rb b/app/models/filter.rb
index 63d0555ab..4dbd12eed 100644
--- a/app/models/filter.rb
+++ b/app/models/filter.rb
@@ -10,7 +10,7 @@ class Filter < ApplicationRecord
       filter.save!
       filter
     rescue ActiveRecord::RecordNotUnique
-      find_by!(params: filter.params).tap(&:touch) # possible thanks to denormalized params
+      find_by!(params: filter.params).tap(&:touch)
     end
   end
 
diff --git a/app/models/filter/resources.rb b/app/models/filter/resources.rb
index 7708b33e8..399c9d271 100644
--- a/app/models/filter/resources.rb
+++ b/app/models/filter/resources.rb
@@ -16,8 +16,9 @@ module Filter::Resources
 
   private
     # `denormalize_resource_ids` stores resource ids in the params column to
-    #    1) enforce uniqueness via db constraints
-    #    2) easily turn all filter params into a query string
+    #    1) Enforce uniqueness via db constraints
+    #    2) Look up identical filters by a single column
+    #    3) Easily turn all filter params into a query string
     def denormalize_resource_ids
       params["bucket_ids"] = buckets.ids
       params["tag_ids"] = tags.ids