diff --git a/zip-0308.rst b/zip-0308.rst
index 759f1329..32faed45 100644
--- a/zip-0308.rst
+++ b/zip-0308.rst
@@ -348,6 +348,10 @@ The values of ``unmigrated_amount`` and ``migrated_amount`` MUST take into
 account failed transactions, that were not mined within their expiration
 height.
 
+The values of ``unfinalized_migrated_amount`` and ``finalized_migrated_amount``
+are the total amounts sent to the Sapling destination address in migration
+transactions, excluding fees.
+
 ``migration_txids`` is a list of strings representing transaction IDs of all
 known migration transactions involving this wallet, as lowercase hexadecimal
 in RPC byte order. A given transaction is defined as a migration transaction