[Commentor] LC-261 Ian Jacobs [Working Group decision] We feel that this is not required, as the document is informative. The work on conformance (and the related disclaimers) will be done in the mobileOK trustmark document. [Commentor reply] yes [Comment] 
I suggest "This document only includes best practices that primarily affect mobile access to the Web." You may also wish to have a look at some of the verbiage insection 3of UAAG 1.0 (on Conformance). For instance, adapting this text might be useful: "The UAWG expects conformance this document to be a strong indicator of accessibility, but it may be neither a necessary nor a sufficient condition for ensuring the accessibility of software. Thus, some software may not conform to this document but still be accessible to some users with disabilities. Conversely, some software may conform to this document but still be inaccessible to some users with disabilities. Some requirements of this document may not benefit some users for some content, but the requirements are expected to benefit many users with disabilities, for general purpose content."