diff --git a/guides/common/modules/con_upgrading-prerequisites.adoc b/guides/common/modules/con_upgrading-prerequisites.adoc
index 15a83acf11..28db303e81 100644
--- a/guides/common/modules/con_upgrading-prerequisites.adoc
+++ b/guides/common/modules/con_upgrading-prerequisites.adoc
@@ -16,6 +16,11 @@ Upgrading {SmartProxy} takes approximately 10{range}30 minutes.
 
 * Ensure that you have sufficient storage space on your server.
 For more information, see {InstallingServerDocURL}Preparing_your_Environment_for_Installation_{project-context}[Preparing your Environment for Installation] in _{InstallingServerDocTitle}_ and {InstallingSmartProxyDocURL}preparing-environment-for-capsule-installation[Preparing your Environment for Installation] in _Installing {SmartProxyServer}_.
+ifndef::foreman-deb[]
+* Ensure that you have at least the same amount of free space on `{postgresql-lib-dir}` as that consumed by `{postgresql-data-dir}`.
+Upgrading to {Project} {ProjectVersion} involves a PostgreSQL 12 to PostgreSQL 13 upgrade.
+The contents of `{postgresql-data-dir}` are backed up during the PostgreSQL upgrade. 
+endif::[]
 * Back up your {ProjectServer} and all {SmartProxyServers}.
 For more information, see {AdministeringDocURL}backing-up-{project-context}-server-and-{smart-proxy-context}_admin[Backing Up {ProjectServer} and {SmartProxyServer}] in _{AdministeringDocTitle}_.
 * Plan for updating any scripts you use that contain {Project} API commands because some API commands differ between versions of {Project}.