diff --git a/docs/development/03biomaterial.md b/docs/development/03biomaterial.md
index 0b347d26e98e1b032e59a81ab66ad48b664d5a8f..1e9a11057cb74c5d2987e54c14ccccd9547361b3 100644
--- a/docs/development/03biomaterial.md
+++ b/docs/development/03biomaterial.md
@@ -13,7 +13,7 @@
 
 ## **PAPER**
 
-In this video, Cory Morrison demonstrates how to make paper from grass, which helps me with making paper from flower waste. 
+**In this video, Cory Morrison demonstrates how to make paper from grass, which helps me with making paper from flower waste.**
 
 <iframe width="1000" height="400" src="https://www.youtube.com/embed/FOb34_s-K1M?si=StuFGYUIwErOo7P9" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>