diff --git a/aurweb/scripts/rendercomment.py b/aurweb/scripts/rendercomment.py
index 31f3fdd4..124b8f20 100755
--- a/aurweb/scripts/rendercomment.py
+++ b/aurweb/scripts/rendercomment.py
@@ -121,6 +121,20 @@ class HeadingExtension(markdown.extensions.Extension):
         md.treeprocessors.register(HeadingTreeprocessor(md), "heading", 30)
 
 
+class StrikethroughInlineProcessor(markdown.inlinepatterns.InlineProcessor):
+    def handleMatch(self, m, data):
+        el = Element("del")
+        el.text = m.group(1)
+        return el, m.start(0), m.end(0)
+
+
+class StrikethroughExtension(markdown.extensions.Extension):
+    def extendMarkdown(self, md):
+        pattern = r"~~(.*?)~~"
+        processor = StrikethroughInlineProcessor(pattern, md)
+        md.inlinePatterns.register(processor, "del", 40)
+
+
 def save_rendered_comment(comment: PackageComment, html: str):
     with db.begin():
         comment.RenderedComment = html
@@ -142,6 +156,7 @@ def update_comment_render(comment: PackageComment) -> None:
             FlysprayLinksExtension(),
             GitCommitsExtension(pkgbasename),
             HeadingExtension(),
+            StrikethroughExtension(),
         ],
     )
 
@@ -153,6 +168,9 @@ def update_comment_render(comment: PackageComment) -> None:
         "h6",
         "br",
         "hr",
+        "del",
+        "details",
+        "summary",
     ]
     html = bleach.clean(html, tags=allowed_tags)
     save_rendered_comment(comment, html)
diff --git a/test/test_rendercomment.py b/test/test_rendercomment.py
index f9edb45b..1506a9a4 100644
--- a/test/test_rendercomment.py
+++ b/test/test_rendercomment.py
@@ -105,6 +105,13 @@ def test_markdown_conversion(user: User, pkgbase: PackageBase):
     assert comment.RenderedComment == expected
 
 
+def test_markdown_strikethrough(user: User, pkgbase: PackageBase):
+    text = "*~~Hello~~world*~~!~~"
+    comment = create_comment(user, pkgbase, text)
+    expected = "<p><em><del>Hello</del>world</em><del>!</del></p>"
+    assert comment.RenderedComment == expected
+
+
 def test_html_sanitization(user: User, pkgbase: PackageBase):
     text = '<script>alert("XSS!")</script>'
     comment = create_comment(user, pkgbase, text)