diff --git a/lib/linguist/blob_helper.rb b/lib/linguist/blob_helper.rb
index 8667cc91..865e14d6 100644
--- a/lib/linguist/blob_helper.rb
+++ b/lib/linguist/blob_helper.rb
@@ -69,6 +69,10 @@ module Linguist
       !file? && !large?
     end
 
+    def generated?
+      ['.xib', '.nib', '.pbxproj'].include?(pathname.extname)
+    end
+
     def language
       if text?
         shebang_language || pathname.language
diff --git a/test/test_blob.rb b/test/test_blob.rb
index c7e23d48..b7c13038 100644
--- a/test/test_blob.rb
+++ b/test/test_blob.rb
@@ -103,6 +103,13 @@ class TestBlob < Test::Unit::TestCase
     assert !blob("octocat.psd").image?
   end
 
+  def test_generated
+    assert !blob("README").generated?
+    assert blob("MainMenu.xib").generated?
+    assert blob("MainMenu.nib").generated?
+    assert blob("project.pbxproj").generated?
+  end
+
   def test_language
     assert_equal Language['Ruby'], blob("foo.rb").language
     assert_equal Language['Ruby'], blob("script.rb").language