diff --git a/subjects/rt/README.md b/subjects/rt/README.md
index e05d214e6..be7e6d4e0 100644
--- a/subjects/rt/README.md
+++ b/subjects/rt/README.md
@@ -10,7 +10,7 @@ To understand better how ray tracing works it is highly suggested that you look
 
 Next is an image produced by a ray tracer like the one you should create:
 
-![image.png](raytrace3.png)
+![image.png](raytrace3.avif)
 
 ### Objectives
 
diff --git a/subjects/rt/raytrace3.avif b/subjects/rt/raytrace3.avif
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diff --git a/subjects/rt/raytrace3.png b/subjects/rt/raytrace3.png
deleted file mode 100644
index 72bff4c71..000000000
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