diff --git a/cot-site-macros/src/md_pages/rendering.rs b/cot-site-macros/src/md_pages/rendering.rs
index d1b52a0..5199c4a 100644
--- a/cot-site-macros/src/md_pages/rendering.rs
+++ b/cot-site-macros/src/md_pages/rendering.rs
@@ -3,7 +3,7 @@ use std::fmt::Write;
 use comrak::html::{
     ChildRendering, Context, format_document_with_formatter, format_node_default, render_sourcepos,
 };
-use comrak::nodes::{AstNode, NodeLink, NodeValue};
+use comrak::nodes::{AstNode, NodeCodeBlock, NodeLink, NodeValue};
 use comrak::options::Plugins;
 use comrak::{Arena, Options, parse_document};
 use cot_site_common::Version;
@@ -47,10 +47,36 @@ fn format_node_custom<'a>(
     match node.data.borrow().value {
         NodeValue::Table(_) => render_table_custom(context, node, entering),
         NodeValue::Link(ref ln) => render_link_custom(context, node, entering, ln),
+        NodeValue::CodeBlock(ref cb) => render_code_block_custom(context, node, entering, cb),
         _ => format_node_default(context, node, entering),
     }
 }
 
+fn render_code_block_custom<'a>(
+    context: &mut Context<PageContext>,
+    _node: &'a AstNode<'a>,
+    entering: bool,
+    cb: &NodeCodeBlock,
+) -> Result<ChildRendering, std::fmt::Error> {
+    let mut new_cb = cb.clone();
+    new_cb.literal = remove_hidden_lines(&cb.literal);
+
+    let node = AstNode::from(NodeValue::CodeBlock(Box::new(new_cb)));
+
+    format_node_default(context, &node, entering)
+}
+
+fn remove_hidden_lines(input: &str) -> String {
+    let mut literal = String::new();
+    for line in input.lines() {
+        if !line.starts_with("# ") {
+            literal.push_str(line);
+            literal.push('\n');
+        }
+    }
+    literal
+}
+
 fn render_table_custom<'a>(
     context: &mut Context<PageContext>,
     node: &'a AstNode<'a>,
@@ -234,4 +260,18 @@ mod tests {
         );
         test_resolve!("cot", "cot");
     }
+
+    #[test]
+    fn test_code_block_filtering() {
+        let md = "```rust\n# hidden\nvisible\n```";
+        let mut options = Options::default();
+        options.render.r#unsafe = true;
+        let plugins = Plugins::default();
+        let version = Version::new(0, 5, 0);
+
+        let html = markdown_to_html(md, &options, &plugins, version);
+
+        assert!(html.contains("visible"));
+        assert!(!html.contains("hidden"));
+    }
 }