diff --git a/pages/Interfaces.md b/pages/Interfaces.md
index 74baab7f9..f52861ace 100644
--- a/pages/Interfaces.md
+++ b/pages/Interfaces.md
@@ -2,7 +2,7 @@
 
 One of TypeScript's core principles is that type checking focuses on the *shape* that values have.
 This is sometimes called "duck typing" or "structural subtyping".
-In TypeScript, interfaces fill the role of naming these types, and are a powerful way of defining contracts within your code as well as contracts with code outside of your project.
+In TypeScript, interfaces fill the role of naming these shapes, and are a powerful way of defining contracts within your code as well as contracts with code outside of your project.
 
 # Our First Interface