diff --git a/02.-Tech-Spec.md b/02.-Tech-Spec.md
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--- a/02.-Tech-Spec.md
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@@ -1,3 +1,6 @@
+```
+N.B. STILL A WORKING DOCUMENT - BEING REFINED AND THUS SUBJECT TO CHANGE
+```
 # OGB Technical Specification
 
 ## OGB Modules