diff --git a/src/ch02-03-composite-types.md b/src/ch02-03-composite-types.md
index bbdffa7..1892f8d 100644
--- a/src/ch02-03-composite-types.md
+++ b/src/ch02-03-composite-types.md
@@ -77,7 +77,7 @@ have their own special formatting and use curly braces.
 ```Clarity
 {
 	id: u5, ;; a uint
-	username: "ClarityIsAwesome", ;; an ASCI string
+	username: "ClarityIsAwesome", ;; an ASCII string
 	address: 'ST1HTBVD3JG9C05J7HBJTHGR0GGW7KXW28M5JS8QE ;; and a principal
 }
 ```