More detailed instructions on keyword.txt

Author: SableRaf

README.md

@@ -59,7 +59,8 @@ The website is set up to deploy itself whenever a new GitHub release is created
 The website repo has a script that generates the `keywords.txt` file into the `processing4` repo to use for syntax highlighting the PDE. Follow these steps in order to generate that file:
 
 1. Make sure you have this `processing-website` repo and the `processing4` repo next to each other on your computer
-2. Run `npm run updateKeywords`
+2. Make sure the [JavaDoc and reference](https://github.com/processing/processing-website/blob/main/docs/reference.md) are up to date with the latest version of Processing. Otherwise make the necessary updates to the JavaDoc in the `processing4` repo then [run the Doclet script](https://github.com/processing/processing-doclet/blob/main/README.md).
+3. Run `npm run updateKeywords`
 
 The `processing4` repo now has an updated `java/keywords.txt` file.