FAQ.md

@@ -121,16 +121,22 @@ Then add the following to your local host table:
 
 Please contact team@openapitools.org with the details and we'll follow up with you.
 
-## Some generators are marked as beta or deprecated. What does that mean?
+### Some generators are marked as beta or deprecated. What does that mean?
 
 For "beta", it means the generator is usually newly-added or not that mature in terms of functionality and feature supported.
 
 For "deprecated", it means the generator is no longer maintained due to various reasons such as languages no longer officially support (e.g. Swift 1.x). One can still use the generator or even submit PRs to improve it but users should not have any expectation in terms of the output produced by the generator.
 
-## Is it reasonable to expect the output by the generator would work appropriately and securely?
+### Is it reasonable to expect the output by the generator would work appropriately and securely?
 
 We do not guarantee the output by the generator would work appropriately and securely. It's the responsibility of the users to evaluate and test the output to ensure it can meet their requirements.
 
+### How's the primitive type handled in the generator?
+
+The official definition of the primitive type can be found in https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#data-types
+
+Primitive types are usually mapped to primitive types in the corresponding programming language and we do not recommend mapping primitive types to models (e.g. primitive type wrappers) as this does not conform to the specification.
+
 ## git
 
 ### How can I rebase my PR on the latest master?