Get different kind of entries relatedTo one asset (many to one)?

Question

I got an asset field called docs which is contained in 2 different entries.
Those entries are in different sections and they contain the docs field directly or through a matrix field called articleBody.

I made two queries relatedTo and merge them thereafter.
It works but would it be a better way by combining the two queries in one relatedTo call?

Query 1: pages section entries contain docs field inside a matrix field called articleBody
Query 2: library section entries contain docs field directly

        $criteria1 = craft()->elements->getCriteria(ElementType::Entry);
        $criteria1->section = 'pages';
        $criteria1->relatedTo = array(
            'targetElement' => $asset->id,
            'field' => 'articleBody.docs'
        );

        $criteria2 = craft()->elements->getCriteria(ElementType::Entry);
        $criteria2->section = 'library';
        $criteria2->relatedTo = array(
            'targetElement' => $asset->id,
            'field' => 'docs'
        );

        $criteria = array_merge($criteria1, $criteria2);

Answer 1

OK in fact it was very simple: criteria params accept arrays...

        $criteria = craft()->elements->getCriteria(ElementType::Entry);

        $fields = [
            'articleBody.efficyDocuments',
            'efficyDocuments'
        ];

        $criteria->relatedTo = array(
            'targetElement' => $asset->id,
            'field' => $fields,
        );