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vendor/phpoffice/phpspreadsheet/README.md

@@ -91,6 +91,33 @@ Read more about it, including install instructions, in the [official documentati
 
 Please ask your support questions on [StackOverflow](https://stackoverflow.com/questions/tagged/phpspreadsheet), or have a quick chat on [Gitter](https://gitter.im/PHPOffice/PhpSpreadsheet).
 
+## Patreon
+
+I am now running a [Patreon](https://www.patreon.com/MarkBaker) to support the work that I do on PhpSpreadsheet.
+
+Supporters will receive access to articles about working with PhpSpreadsheet, and how to use some of its more advanced features.
+
+Posts already available to Patreon supporters:
+ - The Dating Game
+   - A  look at how MS Excel (and PhpSpreadsheet) handle date and time values.
+
+The next post (currently being written) will be:
+ - Looping the Loop
+   - Advice on Iterating through the cells in a worksheet.
+
+My aim is to post at least one article each month, taking a detailed look at some feature of MS Excel and how to use that feature in PhpSpreadsheet, or on how to perform different activities in PhpSpreadsheet.
+
+Planned posts for the future include topics like:
+ - Tables
+ - Structured References
+ - Array Formulae
+ - Conditional Formatting
+ - Data Validation
+ - Formula Debugging
+ - Value Binders
+
+After a period of six months exclusive to Patreon supporters, articles will be incorporated into the public documentation for the library.
+
 ## PHPExcel vs PhpSpreadsheet ?
 
 PhpSpreadsheet is the next version of PHPExcel. It breaks compatibility to dramatically improve the code base quality (namespaces, PSR compliance, use of latest PHP language features, etc.).