diff --git a/Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.html b/Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.yaml
similarity index 98%
rename from Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.html
rename to Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.yaml
index b25c416..4f73915 100644
--- a/Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.html
+++ b/Chapter_Three/Lecture_4_Lab/myapp/myapp-deployment.yaml
@@ -1,4 +1,4 @@
-piVersion: apps/v1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: myapp-deployment
diff --git a/Chapter_Three/Lecture_4_Lab/myapp/myapp-service.html b/Chapter_Three/Lecture_4_Lab/myapp/myapp-service.yaml
similarity index 100%
rename from Chapter_Three/Lecture_4_Lab/myapp/myapp-service.html
rename to Chapter_Three/Lecture_4_Lab/myapp/myapp-service.yaml