Update model-binding.md

jonsequitur · web-flow · commit 4f7a7e7eb302 · 2022-02-03T12:12:29.000-08:00
diff --git a/docs/model-binding.md b/docs/model-binding.md
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 # Model Binding
 
+_**This document describes System.CommandLine Beta 1. Some of the functionality described here now requires a separate package, [System.CommandLine.NamingConventionBinder](https://www.nuget.org/packages/System.CommandLine.NamingConventionBinder). For more details, please see [the Beta 2 announcement](https://github.com/dotnet/command-line-api/issues/1537).**_
+
 Parsing command line arguments is a means to an end. You probably don't really want to think about parsing the command line. You just want some arguments passed to a method, based on some command line arguments.
 
 In C#, the application entry point method has always looked something like this:
