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diff --git a/doc/development/database/multiple_databases.md b/doc/development/database/multiple_databases.md
index beb6b938730..176e1a54ea2 100644
--- a/doc/development/database/multiple_databases.md
+++ b/doc/development/database/multiple_databases.md
@@ -74,7 +74,14 @@ in GitLab 14.1. This feature is still under development, and is not ready for pr
### Configure single database
-By default, GDK is configured to run with multiple databases. To configure GDK to use a single database:
+By default, GDK is configured to run with multiple databases.
+
+WARNING:
+Switching back-and-forth between single and multiple databases in
+the same development instance is discouraged. Any data in the `ci`
+database will not be accessible in single database mode. For single database, you should use a separate development instance.
+
+To configure GDK to use a single database:
1. On the GDK root directory, run: