It is sometimes useful for publishers of ratings to provide a brief supporting explanation, giving context and background to the rating decision. This arises in particular for fact checking, which uses the ClaimReview type (a subtype of Review) and an associated Rating which is often but not always numeric.

• a new Property named "ratingExplanation", expected on Rating, with Text value
• definition: "A short explanation (e.g. one to two sentences) providing background context, facts and information that led to the conclusion expressed in the rating."

This idea was discussed in the fact checking community during Check & Tech, and Global Fact events in 2019, and is proposed here as something to be experimentally implemented. So it would go into Pending area initially.