README.md in ccs-frontend_helpers-0.1.2 vs README.md in ccs-frontend_helpers-0.2.0

@@ -6,9 +6,20 @@
 The CCS Frontend Helpers gem was created for use in the Crown Marketplace projects at the Crown Commercial Service.
 This project contains two applications (both use the Ruby on Rails framework):
 - [Crown Marketplace](https://github.com/Crown-Commercial-Service/crown-marketplace)
 - [Crown Marketplace Legacy](https://github.com/Crown-Commercial-Service/crown-marketplace-legacy)
 
+## Compatibility
+
+The following table shows the version of CCS Frontend Helpers that you should use for your targeted version of GOV.UK Frontend:
+
+| CCS Frontend Helpers Version | Target GOV.UK Frontend Version |
+| ----------------------------- | ------------------------------ |
+| [0.2.0](https://github.com/tim-s-ccs/ccs-frontend_helpers/releases/tag/v0.2.0) | [5.2.0](https://github.com/alphagov/govuk-frontend/releases/tag/v5.2.0) |
+| [0.1.2](https://github.com/tim-s-ccs/ccs-frontend_helpers/releases/tag/v0.1.2) | [4.7.0](https://github.com/alphagov/govuk-frontend/releases/tag/v4.7.0) |
+
+Any other versions of GOV.UK Frontend not shown above _may_ still be compatible, but have not been specifically tested and verified.
+
 ## Installation
 
 Install the gem and add to the application's Gemfile by executing:
 
     $ bundle add ccs-frontend_helpers