diff --git a/phosphor-power-supply/power_supply.hpp b/phosphor-power-supply/power_supply.hpp
index b81599b..566deec 100644
--- a/phosphor-power-supply/power_supply.hpp
+++ b/phosphor-power-supply/power_supply.hpp
@@ -488,6 +488,26 @@
         }
     }
 
+    /**
+     * @brief Returns true when INPUT_HISTORY sync is required.
+     */
+    bool isSyncHistoryRequired() const
+    {
+        return syncHistoryRequired;
+    }
+
+    /**
+     * @brief Clears the indicator that sync required for INPUT_HISTORY.
+     *
+     * Sets variable to false to indicate that the sync is no longer required.
+     * This can be used after the PSUManager has reacted to the need for the
+     * INPUT_HISTORY data to be synchronized.
+     */
+    void clearSyncHistoryRequired()
+    {
+        syncHistoryRequired = false;
+    }
+
   private:
     /** @brief systemd bus member */
     sdbusplus::bus::bus& bus;
@@ -858,6 +878,15 @@
     bool inputHistorySupported{false};
 
     /**
+     * @brief Set to true when INPUT_HISTORY sync is required.
+     *
+     * A power supply will need to synchronize its INPUT_HISTORY data with the
+     * other power supplies installed in the system when it goes from missing to
+     * present.
+     */
+    bool syncHistoryRequired{false};
+
+    /**
      * @brief Class that manages the input power history records.
      **/
     std::unique_ptr<history::RecordManager> recordManager;