diff --git a/gemtext/src/lib.rs b/gemtext/src/lib.rs
index 71ab545..f9cc830 100644
--- a/gemtext/src/lib.rs
+++ b/gemtext/src/lib.rs
@@ -61,7 +61,7 @@ impl ToString for Builder {
     fn to_string(&self) -> String {
         let len: usize = self.nodes.iter().map(Node::estimate_len).sum(); // sum up node lengths
         let mut bytes = Vec::with_capacity(len + self.nodes.len()); // add in inter-node newlines
-        render(&self.nodes, &mut bytes).unwrap(); // Writing to a string shouldn't produce errors
+        render(self, &mut bytes).unwrap(); // Writing to a string shouldn't produce errors
 
         unsafe {
             // This is safe because bytes is composed of Strings.  We could have this as
@@ -73,6 +73,20 @@ impl ToString for Builder {
     }
 }
 
+impl AsRef<[Node]> for Builder {
+    /// Get a reference to the internal node list of this builder
+    fn as_ref(&self) -> &[Node] {
+        self.nodes.as_ref()
+    }
+}
+
+impl AsMut<[Node]> for Builder {
+    /// Get a mutable reference to the internal node list of this builder
+    fn as_mut(&mut self) -> &mut [Node] {
+        self.nodes.as_mut()
+    }
+}
+
 /// Render a set of nodes as a document to a writer.
 pub fn render(nodes: impl AsRef<[Node]>, out: &mut impl Write) -> io::Result<()> {
     use Node::*;