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The synchronous_standby_names GUC allows specifying num_sync, the number of synchronous standbys transactions must wait for replies from. This value must be an integer greater than zero. This commit updates the documentation to clarify this requirement. Reported-by: Asphator <asphator@gmail.com> Discussion: https://postgr.es/m/18663-b02f75cb919f1b60@postgresql.org