# Customized Options

> Complete dossiers for 1 core PostgreSQL settings in Customized Options.
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Dossier URLs remain flat; this category exists only to organize browsing and the sidebar.

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Section pages:

- [custom_variable_classes](/parameters/custom-variable-classes/): custom_variable_classes — Sets the list of known custom variable classes. Observed in PG9.0–9.1; its last measured boot default is not set in PG9.1, with sighup context. It was removed in PG9.2.