updating state

header.adoc

@@ -41,11 +41,12 @@ Ved Shanbhogue
 
 // Preamble
 [WARNING]
-.This document is in the link:http://riscv.org/spec-state[Development state]
+.This document is in the link:http://riscv.org/spec-state[Frozen state]
 ====
-Assume everything can change. This draft specification will change before 
-being accepted as standard, so implementations made to this draft 
-specification will likely not conform to the future standard.
+Change is extremely unlikely. A high threshold will be used, and a 
+change will only occur because of some truly critical issue being 
+identified during the public review cycle. Any other desired or needed
+changes can be the subject of a follow-on new extension.
 ====
 [preface]
 === Copyright and license information