tweak

Code/_CodeBuild.md

@@ -17,9 +17,9 @@
 ## Build Environments
 The Docker images that run the CodeBuild, can be managed by AWS or you. If you need specific software, you need to make an image and upload it to ECR and reference it in the pipeline.
 
-## `buildspec.yaml`
+## `buildspec.yml`
 - Provides the build instructions.
-- Needs to be in the root of your project folder (`/buildspec.yaml`) (by default).
+- Needs to be in the root of your project folder (`/buildspec.yml`, relative to the project root) (by default).
 
 ### Phases
 1. `install`: only for installing packages in the build environment. (Code gets pulled before this step.)