Issue #2969642 by claudiu.cristea, simplyshipley: Better documentation

README.md

@@ -98,6 +98,11 @@ source:
       is_ascii: true
 ```
 
+There's also an excellent write-up, [Migrating Microsoft Excel and LibreOffice
+Calc files into Drupal](https://understanddrupal.com/articles/migrating-microsoft-excel-and-libreoffice-calc-files-drupal),
+that goes in deep explaining how to use this plugin in order to migrate
+spreadsheets into Drupal.
+
 ## Author
 
 Claudiu Cristea ([claudiu.cristea](https://www.drupal.org/u/claudiu.cristea))