diff --git a/README.md b/README.md
index 2b0b4a2..1c55c4e 100644
--- a/README.md
+++ b/README.md
@@ -689,8 +689,9 @@ param :invalid, type: :string, validate: -> v {
 
 #### Polymorphic parameter
 
-***Currently, this option is only utilized by the JSONAPI formatter. Define
-a polymorphic parameter, used when formatting JSONAPI relationships.***
+_Note: currently, this option is only utilized by the JSONAPI formatter._
+
+Define a polymorphic parameter, used when formatting JSONAPI relationships.
 
 ```ruby
 format :jsonapi