diff --git a/source/ch-manim.ptx b/source/ch-manim.ptx
index 0dbdaf0..85f6a8e 100644
--- a/source/ch-manim.ptx
+++ b/source/ch-manim.ptx
@@ -366,6 +366,13 @@ This chapter is co-authored by Tien Chih.
a Discord for Manim, people can help here and you can run Python code within the Discord.
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+ https://www.youtube.com/watch?v=UzEoWUGstVU
+ an excellent video by Bismuth, using Manim and the framework of Super Mario speedrunning to communicate mathematics.
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