--- /dev/null
+<?php
+namespace Consolidation\OutputFormatters\Formatters;
+
+/**
+ * Marker interface that indicates that a cell data renderer
+ * (@see Consolidation\OutputFormatters\SturcturedData\RenderCellInterface)
+ * may test for to determine whether it is allowable to add
+ * human-readable formatting into the cell data
+ * (@see Consolidation\OutputFormatters\SturcturedData\NumericCallRenderer).
+ */
+interface HumanReadableFormat
+{
+}