docs: clarify that parameter autofill requires experimental flag (coder#17546)

EdwardAngert · web-flow · commit e6facaa41b8b · 2025-04-23T17:13:08.000Z
Update documentation to indicate that parameter autofill requires `--experiments=auto-fill-parameters` enabled Fixes coder#14673 --------- Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
diff --git a/docs/admin/templates/extending-templates/parameters.md b/docs/admin/templates/extending-templates/parameters.md
@@ -376,6 +376,15 @@ data "coder_parameter" "jetbrains_ide" {
 When the template doesn't specify default values, Coder may still autofill
 parameters.
 
+You need to enable `auto-fill-parameters` first:
+
+```shell
+coder server --experiments=auto-fill-parameters
+```
+
+Or set the [environment variable](../../setup/index.md), `CODER_EXPERIMENTS=auto-fill-parameters`
+With the feature enabled:
+
 1. Coder will look for URL query parameters with form `param.<name>=<value>`.
    This feature enables platform teams to create pre-filled template creation
    links.
