diff --git a/phosphor-regulators/src/chassis.hpp b/phosphor-regulators/src/chassis.hpp
index d9eec81..1fe74cb 100644
--- a/phosphor-regulators/src/chassis.hpp
+++ b/phosphor-regulators/src/chassis.hpp
@@ -16,6 +16,7 @@
 #pragma once
 
 #include "device.hpp"
+#include "id_map.hpp"
 
 #include <memory>
 #include <stdexcept>
@@ -74,6 +75,13 @@
     }
 
     /**
+     * Adds the Device and Rail objects in this chassis to the specified IDMap.
+     *
+     * @param idMap mapping from IDs to the associated Device/Rail/Rule objects
+     */
+    void addToIDMap(IDMap& idMap);
+
+    /**
      * Returns the devices within this chassis, if any.
      *
      * The vector contains regulator devices and any related devices