diff --git a/foreword/implementation.typ b/foreword/implementation.typ
index 763cd38..69387de 100644
--- a/foreword/implementation.typ
+++ b/foreword/implementation.typ
@@ -34,7 +34,7 @@ A snippet of the basic usage of these classes is given in @three-hello-world.
       lang: "js",
     ),
   ),
-caption: [A THREE.js _hello world_]
+  caption: [A THREE.js _hello world_]
 )<three-hello-world>
 
 #heading(level: 3, numbering: none)[Geometries]