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@@ -9,6 +9,12 @@ Why not use existing tools (e.g., Terraform)? Abstracting away the CloudFormatio
 But mainly I had a long weekend and needed something to do while the baby was napping.
 
 ## What?
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+Fair warning: This project is under heavy development and while I try and keep all the documentation _mostly_ up-to-date, some of this stuff will be wrong.
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 At its core, it's a superset of YAML implemented in a way that's compatible with existing YAML parsers. You can put in a valid YAML document, and get the same document back out. Everything added is additional functionality on top of that. You don't need to rewrite your existing templates in a new language, but can start to use the additional functionality right away wherever it provides value.
 
 It adds the ability to [join multiple files together](Merging) and [control how they are merged](Merging#user-content-functions) and use [variables and parameters](Variables), [expressions](Expressions) and [conditional statements and other functions](Functions).