diff --git a/samples/3d-engine-prototypes/index.md b/samples/3d-engine-prototypes/index.md
index d2855f28..b239595f 100644
--- a/samples/3d-engine-prototypes/index.md
+++ b/samples/3d-engine-prototypes/index.md
@@ -32,3 +32,5 @@ Various experiments in software 3D graphics. Warning: Uses no functions or subs!
 ![3dengineqb2.png](img/3dengineqb2.png)
 
 🔗 [3d](../3d.md), [graph](../graph.md)
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+