diff --git a/utils/template_filters.py b/utils/template_filters.py
index 4467a24..085791c 100644
--- a/utils/template_filters.py
+++ b/utils/template_filters.py
@@ -75,6 +75,9 @@ ALLOWED_TAGS = [
     "li",
     "ol",
     "strong",
+    "sup",
+    "sub",
+    "del",
     "ul",
     "span",
     "div",