diff --git a/downstream/modules/platform/proc-controller-configure-system.adoc b/downstream/modules/platform/proc-controller-configure-system.adoc
index eae5b290ad..b753fc42db 100644
--- a/downstream/modules/platform/proc-controller-configure-system.adoc
+++ b/downstream/modules/platform/proc-controller-configure-system.adoc
@@ -45,6 +45,14 @@ If *Gather data for {Analytics}* is set to false, this value is ignored.
 * *Remote Host Headers*: HTTP headers and meta keys to search to decide remote hostname or IP. 
 Add additional items to this list, such as `HTTP_X_FORWARDED_FOR`, if behind a reverse proxy. 
 For more information, see link:{URLAAPOperationsGuide}/assembly-configuring-proxy-support[Configuring proxy support for {PlatformName}].
++
+[Important]
+====
+If a setting is defined in a file (such as a python file or a custom YAML file) or an environment variable, it is considered a hard directive from {PlatformNameShort} infrastructure. 
+The platform regards files on the server to be the official source of truth. 
+If that occurs, UI changes in the *Remote Host Headers* field cannot override the contents of the file. 
+This makes *Remote Host Headers* read-only.
+====
 * *Automation Analytics upload URL*: This value has been set manually in a settings file. 
 This setting is used to configure the upload URL for data collection for Automation Analytics.
 * *Defines subscription usage model and shows Host Metrics*: