diff --git a/hack/next-migration.sh b/hack/next-migration.sh
index ead1214e..6423fb80 100755
--- a/hack/next-migration.sh
+++ b/hack/next-migration.sh
@@ -73,6 +73,10 @@ pkg=$(cat << EOF
 package model
 
 import "${importRoot}/${current}/model"
+
+//
+// JSON field (data) type.
+type JSON = []byte
 EOF
 )