If you're not sure what to write, here's a bit of an outline to get you started. No requirement to conform though if you're comfortable prodviding some appropriate info. 

- Title / short summary of the changes in this PR
- Prior to this PR ____ / how things were and why things needed to change
- After this PR ____ / how things have changed
- Note design decisions / anything that may not be immediately evident when reading the diffs
