diff --git a/control/json/manager.hpp b/control/json/manager.hpp
index 22b5630..2b913fe 100644
--- a/control/json/manager.hpp
+++ b/control/json/manager.hpp
@@ -64,9 +64,12 @@
  *      std::string = Timer package unique identifier
  *      std::vector<std::unique_ptr<ActionBase>> = List of pointers to actions
  * that run when the timer expires
+ *      const std::vector<Group> = List of groups
+ *      bool = If groups should be preloaded before actions are run
  */
 using TimerPkg =
-    std::tuple<std::string, std::vector<std::unique_ptr<ActionBase>>&>;
+    std::tuple<std::string, std::vector<std::unique_ptr<ActionBase>>&,
+               const std::vector<Group>&, bool>;
 /**
  * Data associated with a running timer that's used when it expires
  * Pair constructed of:
@@ -594,6 +597,13 @@
      * @param[out] data - The JSON that will be filled in
      */
     void dumpCache(json& data);
+
+    /**
+     * @brief Add a group to the cache dataset.
+     *
+     * @param[in] group - The group to add
+     */
+    void addGroup(const Group& group);
 };
 
 } // namespace phosphor::fan::control::json