diff --git a/CHANGES.md b/CHANGES.md
index 38b32f1f..3ffeb4e1 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -54,6 +54,11 @@
 * Fix syntax error causing renamer to error out
 
 
+### 0.11.11 (2016-04-05 19:20:00 UTC)
+
+* Add support for SD mkv container
+
+
 ### 0.11.10 (2016-03-17 19:00:00 UTC)
 
 * Fix dbs that should not have been imported to work
diff --git a/sickbeard/common.py b/sickbeard/common.py
index 343e4256..4f931fbe 100644
--- a/sickbeard/common.py
+++ b/sickbeard/common.py
@@ -277,7 +277,7 @@ class Quality:
 
     @staticmethod
     def assumeQuality(name):
-        if name.lower().endswith(('.avi', '.mp4')):
+        if name.lower().endswith(('.avi', '.mp4', '.mkv')):
             return Quality.SDTV
         elif name.lower().endswith('.ts'):
             return Quality.RAWHDTV
diff --git a/tests/common_tests.py b/tests/common_tests.py
index c96aa347..197c51a9 100644
--- a/tests/common_tests.py
+++ b/tests/common_tests.py
@@ -12,6 +12,9 @@ class QualityTests(unittest.TestCase):
     # TODO: repack / proper ? air-by-date ? season rip? multi-ep?
 
     def test_SDTV(self):
+        self.assertEqual(common.Quality.compositeStatus(common.DOWNLOADED, common.Quality.SDTV),
+                         common.Quality.statusFromName('Test.Show.S01E02-GROUP.mkv'))
+
         self.assertEqual(common.Quality.SDTV, common.Quality.nameQuality("Test.Show.S01E02.PDTV.XViD-GROUP"))
         self.assertEqual(common.Quality.SDTV, common.Quality.nameQuality("Test.Show.S01E02.PDTV.x264-GROUP"))
         self.assertEqual(common.Quality.SDTV, common.Quality.nameQuality("Test.Show.S01E02.HDTV.XViD-GROUP"))