diff --git a/doc/update.md b/doc/update.md
index 5af2734..8f95add 100644
--- a/doc/update.md
+++ b/doc/update.md
@@ -2,6 +2,8 @@
 
 ## Upgrading from a non-Omnibus installation to an Omnibus installation
 
+Upgrading from non-Omnibus installations has not been tested by GitLab.com.
+
 If you are using a MySQL database you have to configure a [non-packaged MySQL database](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#using-a-non-packaged-database-management-server) or [convert to PostgreSQL](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/update/mysql_to_postgresql.md) before the backup.
 
 Please be advised that you lose your settings in files such as gitlab.yml, unicorn.rb and smtp_settings.rb.
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libgit2 0.21.2