diff --git a/tailbone/views/master.py b/tailbone/views/master.py
index 611e59f5..cb47a25e 100644
--- a/tailbone/views/master.py
+++ b/tailbone/views/master.py
@@ -413,6 +413,11 @@ class MasterView(View):
             return self.merge_coalesce_fields
         return []
 
+    def get_merge_additive_fields(self):
+        if hasattr(self, 'merge_additive_fields'):
+            return self.merge_additive_fields
+        return []
+
     def merge(self):
         """
         Preview and execute a merge of two records.
@@ -463,6 +468,11 @@ class MasterView(View):
         for field in self.get_merge_coalesce_fields():
             if remove[field] and not keep[field]:
                 result[field] = remove[field]
+        for field in self.get_merge_additive_fields():
+            if isinstance(keep[field], (list, tuple)):
+                result[field] = sorted(set(remove[field] + keep[field]))
+            else:
+                result[field] = remove[field] + keep[field]
         return result
 
     def merge_objects(self, removing, keeping):