Clarification required for folder renditions

Although there is some text in the specification describing renditions for folders, text remains that would lead you to believe that renditions only apply to documents.

2.1.1.1
470: capabilityRenditions (enumCapabilityRendition)
Indicates whether or not the repository exposes renditions of document objects.

2.1.4.2 Renditions
956: Some ECM repositories provide a facility to retrieve alternative representations of a document.

963: Renditions are specific to the version of the document and may differ between
document versions.

2.1.4.2.2
1002: cmis:thumbnail : A rendition whose purpose is to a provide an image preview of the document
without requiring the client to download the full document content stream.

2.1.8.3.2
2168: canGetRenditions
Description: Can retrieve the renditions of this object (getRenditions)
Base Object: cmis:document

Only cmis:document?