diff --git a/docs/development/03biomaterial.md b/docs/development/03biomaterial.md
index 610c7382bc7bbed5a94d3ed42766164665db90a4..f9d420bd1693c354a1deea52a2e4b5284df20027 100644
--- a/docs/development/03biomaterial.md
+++ b/docs/development/03biomaterial.md
@@ -3,9 +3,9 @@
  
 ## **GELATIN**
 
-## **AGAR**
+## **STARCH**
 
-## **ALGINATE**
+## **AGAR**
 
 ## **PAPER**