2024-06-12 - Doc fixes

# Pull Request

> [!Important]
> Please ensure you have named your pull request with the proper naming convention. This is usually in the `YYYY-MM-DD -` format. This aids in maintaining the codebase in a consistent and uniform format.

## Description

- Added brief usage of the signifier in markdown files

## Related Issues

- Fixes #13

## Local Testing

- [x] I have tested these changes on a local environment and confirm they work as expected.

## Checklist

- [x] My changes generate no new warnings or errors.
- [x] I have performed a self-review of my own code/documentation.
- [x] I have updated the change log file (if applicable), linking to the relevant sections.
- [x] I have checked and corrected any mis-spellings and grammatical errors.
- [x] I have ensured that any dependencies are updated and documented.
- [x] I have included relevant unit tests and they pass.
- [x] I have added or updated documentation as needed.

## Additional Notes

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Author: markbattistella

README.md

@@ -4,7 +4,7 @@
 
 </div>
 
-This plugin enhances your Docsify documentation by automatically generating numbered headers for your markdown files. It allows you to configure the header levels, numbering format, and inclusion in the sidebar. By utilizing this plugin, you can easily manage and navigate through your documentation headers, ensuring consistency and improved readability.
+This plugin enhances your Docsify documentation by automatically generating numbered headers for your markdown files. It allows you to configure the header levels, numbering format, and inclusion in the sidebar. By utilising this plugin, you can easily manage and navigate through your documentation headers, ensuring consistency and improved readability.
 
 ## Demo pages
 
@@ -77,6 +77,20 @@ There are several options available for the docsify-auto-headers plugin:
 
 The plugin can be configured to apply scoped heading counts in either the sidebar or the main content, depending on your setup.
 
+### Adding the signifier
+
+When you want to use the heading numbering on a markdown file you can add either of the following signifiers to the **first line** of the document:
+
+```md
+@autoHeader:
+```
+
+```md
+<!-- autoHeader: -->
+```
+
+After the colon (`:`) you can add in the number that will begin for heading level 1 (`H1`).
+
 ### Sidebar
 
 If the `sidebar` option is enabled, the headers will be included in the sidebar and processed before rendering the markdown.