diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index a0ed496..b31254d 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2018-05-08 14:54:25 +0200 using RuboCop version 0.55.0.
+# on 2018-05-08 15:36:14 +0200 using RuboCop version 0.55.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -64,7 +64,7 @@ Metrics/MethodLength:
 # Offense count: 1
 # Configuration parameters: CountComments.
 Metrics/ModuleLength:
-  Max: 223
+  Max: 300
 
 # Offense count: 4
 Metrics/PerceivedComplexity:
@@ -129,7 +129,7 @@ Style/NumericPredicate:
     - 'spec/**/*'
     - 'lib/mongoid/full_text_search.rb'
 
-# Offense count: 262
+# Offense count: 265
 # Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
 Metrics/LineLength:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6fd4122..15d0013 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
-### 0.8.1 (Next)
+### 0.8.3 (Next)
 
-* [#35](https://github.com/mongoid/mongoid_fulltext/pull/35): Mongoid 7 compatibility - [@tomasc](https://github.com/tomasc).
+* [#37](https://github.com/mongoid/mongoid_fulltext/pull/37): Sci & criteria support - [@tomasc](https://github.com/tomasc).
 * Your contribution here.
 
+### 0.8.2 (8/5/2018)
+
+* [#35](https://github.com/mongoid/mongoid_fulltext/pull/35): Mongoid 7 compatibility - [@tomasc](https://github.com/tomasc).
+
 ### 0.8.0 (1/19/2017)
 
 * [#28](https://github.com/mongoid/mongoid_fulltext/pull/28): Moved to the mongoid organization - [@dblock](https://github.com/dblock).
diff --git a/README.md b/README.md
index 195d417..1791363 100644
--- a/README.md
+++ b/README.md
@@ -249,6 +249,40 @@ the AND of all of the individual results for each of the fields. Finally, if a f
 but criteria for that filter aren't passed to `fulltext_search`, the result is as if the filter
 had never been defined - you see both models that both pass and fail the filter in the results.
 
+SCI Support
+-----------
+
+The search respects SCI. From the spec:
+
+```ruby
+class MyDoc
+  include Mongoid::Document
+  include Mongoid::FullTextSearch
+
+  field :title
+  fulltext_search_in :title
+end
+
+class MyInheritedDoc < MyDoc
+end
+```
+
+```ruby
+MyDoc.fulltext_search(…) # => will return both MyDoc as well as MyInheritedDoc documents
+MyInheritedDoc.fulltext_search(…) # => will return only MyInheritedDoc documents
+```
+
+Criteria Support
+----------------
+
+It is also possible to pre-empt the search with Monogid criteria:
+
+```ruby
+MyDoc.where(value: 10).fulltext_search(…)
+```
+
+Please note that this will not work in case an index is shared by multiple classes (that are not connected through inheritance), since a criteria applies only to one class.
+
 Indexing Options
 ----------------
 
diff --git a/lib/mongoid/full_text_search.rb b/lib/mongoid/full_text_search.rb
index cf12703..1730e2c 100644
--- a/lib/mongoid/full_text_search.rb
+++ b/lib/mongoid/full_text_search.rb
@@ -143,6 +143,7 @@ def fulltext_search(query_string, options = {})
       coll = collection.database[index_name]
       cursors = ngrams.map do |ngram|
         query = { 'ngram' => ngram[0] }
+        query.update(document_type_filters)
         query.update(map_query_filters(options))
         count = coll.find(query).count
         { ngram: ngram, count: count, query: query }
@@ -191,7 +192,11 @@ def fulltext_search(query_string, options = {})
     end
 
     def instantiate_mapreduce_result(result)
-      result[:clazz].constantize.find(result[:id])
+      if criteria.selector.empty?
+        result[:clazz].constantize.find(result[:id])
+      else
+        criteria.where(_id: result[:id]).first
+      end
     end
 
     def instantiate_mapreduce_results(results, options)
@@ -295,6 +300,13 @@ def update_ngram_index
 
     private
 
+    # add filter by type according to SCI classes
+    def document_type_filters
+      return {} unless fields['_type'].present?
+      kls = ([self] + descendants).map(&:to_s)
+      { 'class' => { '$in' => kls } }
+    end
+
     # Take a list of filters to be mapped so they can update the query
     # used upon the fulltext search of the ngrams
     def map_query_filters(filters)
diff --git a/spec/models/my_doc.rb b/spec/models/my_doc.rb
new file mode 100644
index 0000000..0a87892
--- /dev/null
+++ b/spec/models/my_doc.rb
@@ -0,0 +1,9 @@
+class MyDoc
+  include Mongoid::Document
+  include Mongoid::FullTextSearch
+
+  field :title
+  field :value, type: Integer
+
+  fulltext_search_in :title
+end
diff --git a/spec/models/my_further_inherited_doc.rb b/spec/models/my_further_inherited_doc.rb
new file mode 100644
index 0000000..42f14e7
--- /dev/null
+++ b/spec/models/my_further_inherited_doc.rb
@@ -0,0 +1,4 @@
+require 'models/my_inherited_doc.rb'
+
+class MyFurtherInheritedDoc < MyInheritedDoc
+end
diff --git a/spec/models/my_inherited_doc.rb b/spec/models/my_inherited_doc.rb
new file mode 100644
index 0000000..3cd0109
--- /dev/null
+++ b/spec/models/my_inherited_doc.rb
@@ -0,0 +1,2 @@
+class MyInheritedDoc < MyDoc
+end
diff --git a/spec/mongoid/criteria_search_spec.rb b/spec/mongoid/criteria_search_spec.rb
new file mode 100644
index 0000000..2e5b8ff
--- /dev/null
+++ b/spec/mongoid/criteria_search_spec.rb
@@ -0,0 +1,14 @@
+
+require 'spec_helper'
+
+describe Mongoid::FullTextSearch do
+  context 'Criteria' do
+    let!(:my_doc_1) { MyDoc.create!(title: 'My Doc 1') }
+    let!(:my_doc_2) { MyDoc.create!(title: 'My Doc 2', value: 10) }
+
+    let(:result) { MyDoc.where(value: 10).fulltext_search('doc') }
+
+    it { expect(result).not_to include my_doc_1 }
+    it { expect(result).to include my_doc_2 }
+  end
+end
diff --git a/spec/mongoid/sci_search_spec.rb b/spec/mongoid/sci_search_spec.rb
new file mode 100644
index 0000000..2b40e66
--- /dev/null
+++ b/spec/mongoid/sci_search_spec.rb
@@ -0,0 +1,31 @@
+
+require 'spec_helper'
+
+describe Mongoid::FullTextSearch do
+  context 'SCI' do
+    let!(:my_doc) { MyDoc.create!(title: 'My Doc') }
+    let!(:my_inherited_doc) { MyInheritedDoc.create!(title: 'My Inherited Doc') }
+    let!(:my_further_inherited_doc) { MyFurtherInheritedDoc.create!(title: 'My Inherited Doc') }
+
+    context 'root class returns results for subclasses' do
+      let(:result) { MyDoc.fulltext_search('doc') }
+      it { expect(result).to include my_doc }
+      it { expect(result).to include my_inherited_doc }
+      it { expect(result).to include my_further_inherited_doc }
+    end
+
+    context 'child class does not return superclass' do
+      let(:result) { MyInheritedDoc.fulltext_search('doc') }
+      it { expect(result).not_to include my_doc }
+      it { expect(result).to include my_inherited_doc }
+      it { expect(result).to include my_further_inherited_doc }
+    end
+
+    context 'child class does not return superclass' do
+      let(:result) { MyFurtherInheritedDoc.fulltext_search('doc') }
+      it { expect(result).not_to include my_doc }
+      it { expect(result).not_to include my_inherited_doc }
+      it { expect(result).to include my_further_inherited_doc }
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a01760d..7b86747 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -22,6 +22,9 @@
   config.connect_to('mongoid_fulltext_test')
 end
 
+Mongoid.logger.level = Logger::INFO
+Mongo::Logger.logger.level = Logger::INFO if Mongoid::Compatibility::Version.mongoid5_or_newer?
+
 RSpec.configure do |c|
   c.before :each do
     DatabaseCleaner.clean