diff --git a/docs/protocol.rst b/docs/protocol.rst
index 96e7e3de..b96ff002 100644
--- a/docs/protocol.rst
+++ b/docs/protocol.rst
@@ -1,6 +1,9 @@
 Protocol specification
 ======================
 
+.. warning:: All objects sent on the network should support protocol v3
+	     starting on Sun, 16 Nov 2014 22:00:00 GMT.
+
 .. toctree::
    :maxdepth: 2