Update README.md

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 # Fill PDF Forms
-A library to programatically identify and fill out PDF forms
+A library to programatically identify and fill out PDF forms.
+
+**WARNING**: This is a fork of the original "pdf_form" crate made by [jsandler18](https://github.com/jsandler18), including all improvements made by [malte-v](https://github.com/malte-v).
 
 ## Example Code
-### Read a PDF and discover the form fields
+Read a PDF and discover the form fields
 ```rust
 extern crate pdf_form;
 use pdf_form::{Form, FieldType};
@@ -18,7 +20,7 @@ for type in field_types {
 
 ```
 
-### Write to the form fields
+Write to the form fields
 ```rust
 extern crate pdf_form;
 use pdf_form::{Form, FieldState};