diff --git a/crates/crates_io_markdown/lib.rs b/crates/crates_io_markdown/lib.rs
index 6a204a71a2d..b3ec061d0c1 100644
--- a/crates/crates_io_markdown/lib.rs
+++ b/crates/crates_io_markdown/lib.rs
@@ -77,7 +77,9 @@ impl<'a> MarkdownRenderer<'a> {
             .build();
 
         let extension_options = ComrakExtensionOptions::builder()
+            .alerts(true)
             .autolink(true)
+            .multiline_block_quotes(true)
             .strikethrough(true)
             .table(true)
             .tagfilter(true)
@@ -670,4 +672,30 @@ There can also be some text in between!
         </picture>
         "#);
     }
+
+    #[test]
+    fn markdown_alerts() {
+        let text = "> [!note]\n> Something of note";
+        assert_snapshot!(markdown_to_html(text, None, ""), @r#"
+        <div class="markdown-alert markdown-alert-note">
+        <p class="markdown-alert-title">Note</p>
+        <p>Something of note</p>
+        </div>
+        "#);
+    }
+
+    #[test]
+    fn markdown_multiline_block_quotes_complex() {
+        let text = "Paragraph one\n\n>>>\nParagraph two\n\n- one\n- two\n>>>";
+        assert_snapshot!(markdown_to_html(text, None, ""), @r#"
+        <p>Paragraph one</p>
+        <blockquote>
+        <p>Paragraph two</p>
+        <ul>
+        <li>one</li>
+        <li>two</li>
+        </ul>
+        </blockquote>
+        "#);
+    }
 }
diff --git a/tests/acceptance/readme-rendering-test.js b/tests/acceptance/readme-rendering-test.js
index db6d8cb48ce..fdaf191415b 100644
--- a/tests/acceptance/readme-rendering-test.js
+++ b/tests/acceptance/readme-rendering-test.js
@@ -66,6 +66,22 @@ graph TD;
     C-->D;
 </code></pre>
 
+<h3>GitHub Style Alert</h3>
+<div class="markdown-alert markdown-alert-note">
+<p class="markdown-alert-title">Note</p>
+<p>Something of note</p>
+</div>
+
+<h3>GitLab Style Multiline Block Quotes</h3>
+<p>Paragraph one</p>
+<blockquote>
+<p>Paragraph two</p>
+<ul>
+<li>one</li>
+<li>two</li>
+</ul>
+</blockquote>
+
 <ul>
   <li>
     <p>Delegate to a method with a different name</p>