diff --git a/airflow/www/utils.py b/airflow/www/utils.py
index 2228341737de6..a215b6131cff3 100644
--- a/airflow/www/utils.py
+++ b/airflow/www/utils.py
@@ -321,8 +321,8 @@ def wrapped_markdown(s, css_class=None):
         return None
 
     return Markup(
-        '<div class="rich_doc {css_class}" >' + markdown.markdown(s) + "</div>"
-    ).format(css_class=css_class)
+        '<div class="rich_doc {css_class}" >'.format(css_class=css_class) + markdown.markdown(s) + "</div>"
+    )
 
 
 def get_attr_renderer():
diff --git a/tests/www/test_utils.py b/tests/www/test_utils.py
index d1c6a2a7f720d..51d73fba286b0 100644
--- a/tests/www/test_utils.py
+++ b/tests/www/test_utils.py
@@ -24,6 +24,7 @@
 from parameterized import parameterized
 
 from airflow.www import utils
+from airflow.www.utils import wrapped_markdown
 from tests.test_utils.config import conf_vars
 
 
@@ -229,3 +230,16 @@ def test_markdown(self):
     def test_markdown_none(self):
         rendered = self.attr_renderer["python_callable"](None)
         self.assertEqual("", rendered)
+
+
+class TestWrappedMarkdown(unittest.TestCase):
+
+    def test_wrapped_markdown_with_docstring_curly_braces(self):
+        rendered = wrapped_markdown("{braces}", css_class="a_class")
+        self.assertEqual('<div class="rich_doc a_class" ><p>{braces}</p></div>', rendered)
+
+    def test_wrapped_markdown_with_some_markdown(self):
+        rendered = wrapped_markdown("*italic*\n**bold**\n", css_class="a_class")
+        self.assertEqual(
+            '''<div class="rich_doc a_class" ><p><em>italic</em>
+<strong>bold</strong></p></div>''', rendered)