diff --git a/lemoncurry/jinja2/bleach.py b/lemoncurry/jinja2/bleach.py
index de09c04..11f884f 100644
--- a/lemoncurry/jinja2/bleach.py
+++ b/lemoncurry/jinja2/bleach.py
@@ -2,10 +2,11 @@ from bleach.sanitizer import Cleaner, ALLOWED_TAGS
 from bleach.linkifier import LinkifyFilter
 from jinja2 import evalcontextfilter, Markup
 
-TAGS = ['cite', 'code', 'p', 'pre', 'img', 'span']
+TAGS = ['cite', 'code', 'details', 'p', 'pre', 'img', 'span', 'summary']
 TAGS.extend(ALLOWED_TAGS)
 ATTRIBUTES = {
     'a': ('href', 'title', 'class'),
+    'details': ('open',),
     'img': ('alt', 'src', 'title'),
     'span': ('class',),
 }
diff --git a/lemoncurry/templatetags/bleach.py b/lemoncurry/templatetags/bleach.py
index 8de5338..982269d 100644
--- a/lemoncurry/templatetags/bleach.py
+++ b/lemoncurry/templatetags/bleach.py
@@ -5,10 +5,11 @@ from django.utils.safestring import mark_safe
 from bleach.sanitizer import Cleaner, ALLOWED_TAGS
 from bleach.linkifier import LinkifyFilter
 
-tags = ['cite', 'code', 'p', 'pre', 'img', 'span']
+tags = ['cite', 'code', 'details', 'p', 'pre', 'img', 'span', 'summary']
 tags.extend(ALLOWED_TAGS)
 attributes = {
     'a': ('href', 'title', 'class'),
+    'details': ('open',),
     'img': ('alt', 'src', 'title'),
     'span': ('class',),
 }