Add clarification for the syn::DeriveInput explanation

Author: 1Git2Clone

README.md

@@ -78,7 +78,8 @@ making a parser for the complex syntax of the language.
 ![Visual representation of syn being the front-end and quote as the back-end](./assets/front-end-ir-back-end.png "Visual representation of syn being the front-end and quote as the back-end")
 
 1. Syn handles the parsing (usually as
-   [`syn::DeriveInput`](https://docs.rs/syn/latest/syn/struct.DeriveInput.html)).
+   [`syn::DeriveInput`](https://docs.rs/syn/latest/syn/struct.DeriveInput.html)
+   for derive macros).
 2. We work with the parsed data.
 3. Our work gets tokenized by the
    [`quote::quote!`](https://docs.rs/quote/latest/quote/macro.quote.html)