diff --git a/zip-0308.rst b/zip-0308.rst
index 2b469999..abb16d3e 100644
--- a/zip-0308.rst
+++ b/zip-0308.rst
@@ -259,6 +259,9 @@ migration transaction.
 
 The ``lock_time`` field MUST be set to 0 (unused).
 
+When creating Sapling shielded Outputs, the outgoing viewing key ``ovk``
+SHOULD be chosen in the same way as for a transfer sent from a t-address.
+
 A node SHOULD treat migration transactions in the same way as transactions
 submitted over the RPC interface.