Add explanation about versioned docs to readme

README.md

@@ -38,6 +38,15 @@ Facebook has adopted a Code of Conduct that we expect project participants to ad
 
 Read our [contributing guide](https://github.com/facebook/Docusaurus/blob/master/CONTRIBUTING.md) to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to Docusaurus.
 
+You might want to make yourself familiar with [docusaurus](https://docusaurus.io/docs/en/installation) to make significant changes to the website. If you only want to make content changes you just need to know about versioned docs.
+
+### Versioned docs
+
+- `/docs` - the files in here are responsible for the "next" version at https://docusaurus.io/docs/en/next/installation.
+- `v1/website/versioned_docs/version-1.4.0` - these are the docs for the currently published version at https://docusaurus.io/docs/en/installation.
+
+To make a fix to the published site you must edit the corresponding markdown file at both folders.
+
 ### Beginner Friendly Bugs
 
 To help you get your feet wet and get you familiar with our contribution process, we have a list of [beginner friendly bugs](https://github.com/facebook/Docusaurus/labels/good%20first%20issue) that contain bugs which are fairly easy to fix. This is a great place to get started.