diff --git a/README.md b/README.md
index 924b3791..006311b5 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,29 @@ engines:
     - examples/
 ```
 
+### Custom file name patterns
+
+All engines check only appropriate files but you can override default set of
+patterns. Patterns are ran aginast the project root direcory so you have to use
+`**` to match files in nested directories. Also note that you have to specify
+all patterns, not only the one you want to add.
+
+```yml
+engines:
+  duplication:
+    enabled: true
+    config:
+      languages:
+        ruby:
+          patterns:
+            - "**/*.rb
+            - "**/*.rake"
+            - "Rakefile"
+            - "**/*.ruby"
+```
+
+
+
 [codeclimate]: https://codeclimate.com/dashboard
 [what-is-duplication]: https://docs.codeclimate.com/docs/duplication-concept
 [flay]: https://github.com/seattlerb/flay
diff --git a/lib/cc/engine/analyzers/analyzer_base.rb b/lib/cc/engine/analyzers/analyzer_base.rb
index 46a0971d..46f2ce24 100644
--- a/lib/cc/engine/analyzers/analyzer_base.rb
+++ b/lib/cc/engine/analyzers/analyzer_base.rb
@@ -70,7 +70,10 @@ def process_file(path)
         def file_list
           @_file_list ||= ::CC::Engine::Analyzers::FileList.new(
             engine_config: engine_config,
-            patterns: self.class::PATTERNS,
+            patterns: engine_config.patterns_for(
+              self.class::LANGUAGE,
+              self.class::PATTERNS,
+            ),
           )
         end
 
diff --git a/lib/cc/engine/analyzers/engine_config.rb b/lib/cc/engine/analyzers/engine_config.rb
index 7bc29124..a3833f6b 100644
--- a/lib/cc/engine/analyzers/engine_config.rb
+++ b/lib/cc/engine/analyzers/engine_config.rb
@@ -55,6 +55,10 @@ def fetch_language(language)
           end
         end
 
+        def patterns_for(language, fallbacks)
+          Array(fetch_language(language).fetch("patterns", fallbacks))
+        end
+
         private
 
         attr_reader :config
diff --git a/spec/cc/engine/analyzers/analyzer_base_spec.rb b/spec/cc/engine/analyzers/analyzer_base_spec.rb
new file mode 100644
index 00000000..8a6344ca
--- /dev/null
+++ b/spec/cc/engine/analyzers/analyzer_base_spec.rb
@@ -0,0 +1,76 @@
+require 'spec_helper'
+require 'cc/engine/analyzers/analyzer_base'
+require 'cc/engine/analyzers/engine_config'
+require 'cc/engine/analyzers/file_list'
+
+module CC::Engine::Analyzers
+  RSpec.describe Base, in_tmpdir: true do
+    class DummyAnalyzer < Base
+      LANGUAGE = "dummy"
+      PATTERNS = [
+        '**/*.a',
+        '**/*.b'
+      ]
+    end
+
+    include AnalyzerSpecHelpers
+
+    let(:engine_config) { EngineConfig.new({}) }
+    let(:analyzer) { DummyAnalyzer.new(engine_config: engine_config) }
+
+    before(:each) do
+      create_source_file("foo.a", "")
+      create_source_file("foo.b", "")
+      create_source_file("foo.c", "")
+    end
+
+    it "lists files according to the default patterns" do
+      expect(analyzer.files).to match_array(['./foo.a', './foo.b'])
+    end
+
+    context "with custom patterns" do
+      let(:engine_config) do
+        EngineConfig.new({
+          "config" => {
+            "languages" => {
+              "dummy" => {
+                "patterns" => [
+                  "**/*.c"
+                ],
+              },
+            },
+          },
+        })
+      end
+
+      it "lists files according to the config patterns" do
+        expect(analyzer.files).to match_array(['./foo.c'])
+      end
+    end
+
+    context "exact pattern" do
+      let(:engine_config) do
+        EngineConfig.new({
+          "config" => {
+            "languages" => {
+              "dummy" => {
+                "patterns" => [
+                  "*.c"
+                ],
+              },
+            },
+          },
+        })
+      end
+
+      before(:each) do
+        Dir.mkdir("nested")
+        create_source_file("nested/foo.c", "")
+      end
+
+      it "lists files exactly according to the config patterns" do
+        expect(analyzer.files).to match_array(['./foo.c'])
+      end
+    end
+  end
+end
diff --git a/spec/cc/engine/analyzers/engine_config_spec.rb b/spec/cc/engine/analyzers/engine_config_spec.rb
index 0c168911..e94cefd9 100644
--- a/spec/cc/engine/analyzers/engine_config_spec.rb
+++ b/spec/cc/engine/analyzers/engine_config_spec.rb
@@ -202,4 +202,30 @@
       expect(engine_config.debug?).to eq(false)
     end
   end
+
+  describe "#patterns_for" do
+    it "returns patterns for specified language" do
+      engine_config = CC::Engine::Analyzers::EngineConfig.new({
+        "config" => {
+          "languages" => {
+            "fancy" => {
+              "patterns" => [
+                "**/*.fancy"
+              ],
+            },
+          },
+        },
+      })
+
+      expect(engine_config.patterns_for("fancy", []))
+        .to match_array(["**/*.fancy"])
+    end
+
+    it "returns fallback patterns for missing language" do
+      engine_config = CC::Engine::Analyzers::EngineConfig.new({})
+
+      expect(engine_config.patterns_for("fancy", ["**/*.fancy"]))
+        .to match_array(["**/*.fancy"])
+    end
+  end
 end