Add requirement for `mapping:` to being a list
@@ -194,7 +194,7 @@ with by specifying the precision explicitly.
### `mapping`
-*Optional.*
+*Optional. Must be a list starting with a `- ` (a dash and a space):*
This can be used to define a list of additional rules that modify the DP
to Home Assistant attribute mapping to something other than a one to one
copy.
blakadder