diff --git a/src/item_updater.hpp b/src/item_updater.hpp
index bc8930e..e07aca8 100644
--- a/src/item_updater.hpp
+++ b/src/item_updater.hpp
@@ -201,6 +201,16 @@
      */
     void processPSUImageAndSyncToLatest();
 
+    /** @brief Retrieve FW version from IMG_DIR_BUILTIN
+     *
+     * This function retrieves the firmware version from the PSU model directory
+     * that is in the IMG_DIR_BUILTIN. It loops through the activations map to
+     * find matching path starts with IMG_DIR_BUILTIN, then gets the
+     * corresponding version ID, and then looks it up in the versions map to
+     * retrieve the associated version string.
+     */
+    std::string getFWVersionFromBuiltinDir();
+
     /** @brief Persistent sdbusplus D-Bus bus connection. */
     sdbusplus::bus_t& bus;