Update configuration.md

content/en/getting-started/configuration.md

@@ -645,6 +645,8 @@ Test and document setting params via JSON env var.
 
 ## Ignore Content and Data Files when Rendering
 
+**Note:** This works, but we recommend you use the newer and more powerful [includeFiles and excludeFiles](https://gohugo.io/hugo-modules/configuration/#module-config-mounts) mount options.
+
 To exclude specific files from the `content` and `data` directories when rendering your site, set `ignoreFiles` to one or more regular expressions to match against the absolute file path.
 
 To ignore files ending with `.foo` or `.boo`: