diff --git a/lib/searchkick/results.rb b/lib/searchkick/results.rb
index beb137f..5f0a277 100644
--- a/lib/searchkick/results.rb
+++ b/lib/searchkick/results.rb
@@ -30,6 +30,8 @@ module Searchkick
             results[type] = results_query(klass, grouped_hits).to_a.index_by { |r| r.id.to_s }
           end
 
+          missing_ids = []
+
           # sort
           results =
             hits.map do |hit|
@@ -43,10 +45,13 @@ module Searchkick
                 end
               end
               [result, hit]
-            end.select { |v| v[0] }
+            end.select do |result, hit|
+              missing_ids << hit["_id"] unless result
+              result
+            end
 
-          if results.size != hits.size
-            warn "[searchkick] WARNING: Records in search index do not exist in database"
+          if missing_ids.any?
+            warn "[searchkick] WARNING: Records in search index do not exist in database: #{missing_ids.join(", ")}"
           end
 
           results
diff --git a/test/index_test.rb b/test/index_test.rb
index c99a55b..97041cc 100644
--- a/test/index_test.rb
+++ b/test/index_test.rb
@@ -85,7 +85,7 @@ class IndexTest < Minitest::Test
   def test_record_not_found
     store_names ["Product A", "Product B"]
     Product.where(name: "Product A").delete_all
-    assert_output nil, "[searchkick] WARNING: Records in search index do not exist in database\n" do
+    assert_output nil, /\[searchkick\] WARNING: Records in search index do not exist in database/ do
       assert_search "product", ["Product B"]
     end
   ensure
--
libgit2 0.21.0