diff --git a/judge/feed.py b/judge/feed.py
index d665dd6..d553d1b 100644
--- a/judge/feed.py
+++ b/judge/feed.py
@@ -40,7 +40,7 @@ class ProblemFeed(Feed):
         key = "problem_feed:%d" % problem.id
         desc = cache.get(key)
         if desc is None:
-            desc = str(markdown(problem.description, "problem"))[:500] + "..."
+            desc = str(markdown(problem.description))[:500] + "..."
             desc = escape_xml_illegal_chars(desc)
             cache.set(key, desc, 86400)
         return desc
diff --git a/judge/jinja2/markdown/__init__.py b/judge/jinja2/markdown/__init__.py
index bcaed82..7b27076 100644
--- a/judge/jinja2/markdown/__init__.py
+++ b/judge/jinja2/markdown/__init__.py
@@ -49,7 +49,7 @@ ALLOWED_TAGS = bleach.sanitizer.ALLOWED_TAGS + [
     "dd",
     "br",
     "details",
-    "summary"
+    "summary",
 ]
 
 ALLOWED_ATTRS = ["src", "width", "height", "href", "class", "open"]