diff --git a/judge/jinja2/markdown/__init__.py b/judge/jinja2/markdown/__init__.py
index 6a081e5..bcaed82 100644
--- a/judge/jinja2/markdown/__init__.py
+++ b/judge/jinja2/markdown/__init__.py
@@ -52,17 +52,14 @@ ALLOWED_TAGS = bleach.sanitizer.ALLOWED_TAGS + [
     "summary"
 ]
 
-ALLOWED_ATTRS = ["src", "width", "height", "href", "class"]
+ALLOWED_ATTRS = ["src", "width", "height", "href", "class", "open"]
 
 
 @registry.filter
 def markdown(value):
-    print("BEFORE:", value)
     extensions = EXTENSIONS
     html = _markdown.markdown(value, extensions=extensions)
     html = bleach.clean(html, tags=ALLOWED_TAGS, attributes=ALLOWED_ATTRS)
     if not html:
         html = escape(value)
-    print("AFTER")
-    print(html)
     return '<div class="md-typeset">%s</div>' % html