Add language for compliance requirements around platforms and archite…

…ctures

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

README.md

@@ -25,7 +25,10 @@ Table of Contents
 In the specifications in the above table of contents, the keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as described in [RFC 2119](http://tools.ietf.org/html/rfc2119) (Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997).
 
 An implementation is not compliant if it fails to satisfy one or more of the MUST or REQUIRED requirements for the protocols it implements.
-An implementation that satisfies all the MUST or REQUIRED and all the SHOULD requirements for its protocols is said to be "unconditionally compliant".
+An implementation that satisfies all the MUST or REQUIRED and all the SHOULD requirements for its protocols is said to be "unconditionally compliant" on one or more CPU architectures.
+Protocols defined by this specification are:
+* Linux containers: runtime.md, config.md, config-linux.md, and runtime-linux.md.
+* Solaris containers: runtime.md, config.md, and config-solaris.md.
 
 # Use Cases