Merge pull request #5395 from EnterpriseDB/jingjingliu20-patch-1

Update index.mdx

product_docs/docs/biganimal/release/using_cluster/01_postgres_access/index.mdx

@@ -27,7 +27,9 @@ So that we can effectively manage the cloud resources and ensure users are prote
 
 ### superuser
 
-Superuser access in BigAnimal is available only where the users are in control of their infrastructure. When using your own cloud account, you can grant the edb_admin role superuser privileges for a cluster. See [Superuser access](/biganimal/latest/getting_started/creating_a_cluster/#superuser-access). If you grant superuser privileges, you must take care to limit the number of connections used by superusers to avoid degraded service or compromising availability.
+Superuser access in BigAnimal is available only where the users are in control of their infrastructure. When using your own cloud account, you can grant the edb_admin role superuser privileges for a cluster. See [Superuser access](/biganimal/latest/getting_started/creating_a_cluster/#superuser-access). 
+
+When granting superuser privileges, ensure you limit the number of connections used by superusers to avoid degrading service or compromising availability. BigAnimal reserves and requires a few superuser connections for the readiness probe, to check if the database is up and able to accept connections, and for the creation of specific roles required in PostgreSQL instances and some extensions. 
 
 !!! note
     Superuser privileges allow you to make Postgres configuration changes using `ALTER SYSTEM` queries. We recommend that you don't do this because it might lead to an unpredictable or unrecoverable state of the cluster. In addition, `ALTER SYSTEM` changes aren't replicated across the cluster.