diff --git a/core/model/fieldtypes/CompositeDBField.php b/core/model/fieldtypes/CompositeDBField.php
new file mode 100644
index 000000000..1ad68f2ab
--- /dev/null
+++ b/core/model/fieldtypes/CompositeDBField.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Apply this interface to any {@link DBField} that doesn't have a 1-1 mapping with a database field.
+ * This includes multi-value fields and transformed fields
+ */
+interface CompositeDBField {
+	
+}
\ No newline at end of file