Continue ibexa_product_specification

Author: adriendupuis

docs/content_management/field_types/field_type_reference/field_type_reference.md

@@ -48,7 +48,7 @@ The following table gives an overview of the supported field types that come wit
 | [Media](mediafield.md)                                     | Validates and stores a media file.                                                                                                                                                             | No                                                                            | Yes                                |
 | [Null](nullfield.md)                                       | Used as fallback for missing field types and for testing purposes.                                                                                                                             | N/A                                                                           | N/A                                |
 | [Page](pagefield.md)                                       | Stores a Page with a layout consisting of multiple zones.                                                                                                                                      | N/A                                                                           | N/A                                |
-| [ProductSpecification](productspecificationfield.md)       | Stores product attributes and VAT                                                                                                                                                              |                                                                               |                                    |
+| [ProductSpecification](productspecificationfield.md)       | Stores product attributes and VAT                                                                                                                                                              | Yes but only with [Product Search](product_search_criteria.md)                | Yes                                |
 | [Relation](relationfield.md)                               | Validates and stores a relation to a content item.                                                                                                                                             | Yes, with both [`Field`](fieldrelation_criterion.md) Criteria                 | Yes                                |
 | [RelationList](relationlistfield.md)                       | Validates and stores a list of relations to content items.                                                                                                                                     | Yes, with [`FieldRelation` Criterion](fieldrelation_criterion.md)             | Yes                                |
 | [RichText](richtextfield.md)                               | Validates and stores structured rich text in DocBook xml format, and exposes it in several formats. Available via [IbexaFieldTypeRichTextBundle](https://github.com/ibexa/fieldtype-richtext). | Yes[^1^](#1-note-on-legacy-search-engine)                                     | Yes                                |