diff --git a/phosphor-power-supply/psu_manager.hpp b/phosphor-power-supply/psu_manager.hpp
index 8725ce8..46560a7 100644
--- a/phosphor-power-supply/psu_manager.hpp
+++ b/phosphor-power-supply/psu_manager.hpp
@@ -377,6 +377,25 @@
      * the /org/open_power/sensors root D-Bus path.
      */
     sdbusplus::server::manager_t historyManager;
+
+    /**
+     * @brief GPIO to toggle to 'sync' power supply input history.
+     */
+    std::unique_ptr<GPIOInterfaceBase> syncHistoryGPIO = nullptr;
+
+    /**
+     * @brief Toggles the GPIO to sync power supply input history readings
+     *
+     * This GPIO is connected to all supplies.  This will clear the
+     * previous readings out of the supplies and restart them both at the
+     * same time zero and at record ID 0.  The supplies will return 0
+     * bytes of data for the input history command right after this until
+     * a new entry shows up.
+     *
+     * This will cause the code to delete all previous history data and
+     * start fresh.
+     */
+    void syncHistory();
 };
 
 } // namespace phosphor::power::manager