/**
* @param bool $collect Whether to collect logs. @see setCollect()
- * @param callable $filter Filter logs before collecting/printing. Signature is
+ * @param callable|null $filter Filter logs before collecting/printing. Signature is
* string|null function ( string $message, string $level, array $context );
* @param bool $collectContext Whether to keep the context passed to log
* (since 1.29, @see setCollectContext()).