Note regarding different repositories

docs/latest/contributing.md

@@ -4,6 +4,14 @@
 
 Fork the repository, make your change and submit a pull request.
 
+- The OHIF Viewer consists of code from three different repositories. Make sure
+  your change is modifying the appropriate one:
+  - `ohif-core`: Business Logic
+  - `react-viewerbase`: Reusable React Component Library
+  - `Viewers`: The glue, PWA, and primary extension point
+- At a minimum, you may want to read the following documentation:
+  - h
+
 ## Any guidance on submitting changes?
 
 While we do appreciate code contributions, triaging and integrating contributed
@@ -35,14 +43,14 @@ Replacing the number 237 in the link below with your pull request number should
 let you test it as well and you can use this link for discussions on github
 without requiring reviewers to download and build your branch.
 
-```
+```bash
 https://deploy-preview-237--ohif.netlify.com/viewer/?url=https://s3.eu-central-1.amazonaws.com/ohif-viewer/sampleDICOM.json
 ```
 
 If you have made a documentation change, a link like this will let you preview
 the gitbook generated by the pull request:
 
-```
+```bash
 https://deploy-preview-237--ohif.netlify.com/contributing.html
 ```