diff --git a/renderer/src/concurrent/executor.rs b/renderer/src/concurrent/executor.rs
index e6b0932e..0ed50bae 100644
--- a/renderer/src/concurrent/executor.rs
+++ b/renderer/src/concurrent/executor.rs
@@ -14,7 +14,9 @@
 pub trait Executor {
     /// Like the Rayon snippet:
     ///
-    ///     (0..length).into_par_iter().flat_map(builder).collect()
+    /// ```norun
+    /// (0..length).into_par_iter().flat_map(builder).collect()
+    /// ```
     fn flatten_into_vector<T, F>(&self, length: usize, builder: F) -> Vec<T>
                                  where T: Send, F: Fn(usize) -> Vec<T> + Send + Sync;
 }
diff --git a/renderer/src/concurrent/scene_proxy.rs b/renderer/src/concurrent/scene_proxy.rs
index 075e25ce..861e7444 100644
--- a/renderer/src/concurrent/scene_proxy.rs
+++ b/renderer/src/concurrent/scene_proxy.rs
@@ -77,9 +77,11 @@ impl SceneProxy {
     ///
     /// Exactly equivalent to:
     ///
-    ///     for command in scene_proxy.build_with_stream(options) {
-    ///         renderer.render_command(&command)
-    ///     }
+    /// ```norun
+    /// for command in scene_proxy.build_with_stream(options) {
+    ///     renderer.render_command(&command)
+    /// }
+    /// ```
     #[inline]
     pub fn build_and_render<D>(&self, renderer: &mut Renderer<D>, build_options: BuildOptions)
                                where D: Device {