diff --git a/docs/client-server/specification.rst b/docs/client-server/OLD_specification.rst
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@@ -2,6 +2,20 @@
 Matrix Client-Server API
 ========================
 
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+.. WARNING::
+  This specification is old. Please see /docs/specification.rst instead.
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 The following specification outlines how a client can send and receive data from 
 a home server.