diff --git a/lib/searchkick/index.rb b/lib/searchkick/index.rb
index 4e112f5..b2eb62a 100644
--- a/lib/searchkick/index.rb
+++ b/lib/searchkick/index.rb
@@ -161,6 +161,7 @@ module Searchkick
       RecordData.new(self, record).document_type
     end
 
+    # TODO use like: [{_index: ..., _id: ...}] in Searchkick 5
     def similar_record(record, **options)
       like_text = retrieve(record).to_hash
         .keep_if { |k, _| !options[:fields] || options[:fields].map(&:to_s).include?(k) }
--
libgit2 0.21.0