diff --git a/tests/sphinx_generic/index.md b/tests/sphinx_generic/index.md
index d699b79..649e8c0 100644
--- a/tests/sphinx_generic/index.md
+++ b/tests/sphinx_generic/index.md
@@ -17,6 +17,8 @@ This is a [pending ref](index)
 
 [example]: http://example.com/foobar "Example"
 
+External link to Markdown file: [Readme](https://github.com/readthedocs/recommonmark/blob/master/README.md).
+
 Foo
 
 ----
diff --git a/tests/test_sphinx.py b/tests/test_sphinx.py
index 06078b1..74f83cf 100644
--- a/tests/test_sphinx.py
+++ b/tests/test_sphinx.py
@@ -125,6 +125,12 @@ def test_links(self):
              '</a>'),
             output
         )
+        self.assertIn(
+            ('External link to Markdown file: '
+             '<a class="reference external" '
+             'href="https://github.com/readthedocs/recommonmark/blob/master/README.md">Readme</a>.'),
+            output
+        )
 
     def test_image(self):
         output = self.read_file('index.html')