diff --git a/doc/tutorials/shader_toy_particles/index.rst b/doc/tutorials/shader_toy_particles/index.rst
index 52e096e58..7a56dc20a 100644
--- a/doc/tutorials/shader_toy_particles/index.rst
+++ b/doc/tutorials/shader_toy_particles/index.rst
@@ -4,7 +4,8 @@ Shader Toy - Particles
 ======================
 
 .. contents::
-
+    :class: this-will-duplicate-information-and-it-is-still-useful-here
+    
 .. raw:: html
 
     <iframe width="560" height="315" src="https://www.youtube.com/embed/99AAAzf5ndY" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>