diff --git a/item_updater.hpp b/item_updater.hpp
index e9bea6f..14737fb 100644
--- a/item_updater.hpp
+++ b/item_updater.hpp
@@ -25,6 +25,16 @@
         ItemUpdater(ItemUpdater&&) = delete;
         ItemUpdater& operator=(ItemUpdater&&) = delete;
 
+        /*
+         * @brief Types of Activation status for image validation.
+         */
+        enum class ActivationStatus
+        {
+            ready,
+            invalid,
+            active
+        };
+
         /** @brief Constructs ItemUpdater
          *
          * @param[in] bus    - The Dbus bus object
@@ -50,6 +60,18 @@
          */
         void createActivation(sdbusplus::message::message& msg);
 
+        /**
+         * @brief Validates the presence of SquashFS iamge in the image dir.
+         *
+         * @param[in]  versionId - The software version ID.
+         * @param[out] result    - ActivationStatus Enum.
+         *                         ready if validation was successful.
+         *                         invalid if validation fail.
+         *                         active if image is the current version.
+         *
+         */
+        ActivationStatus validateSquashFSImage(const std::string& versionId);
+
         /** @brief Persistent sdbusplus DBus bus connection. */
         sdbusplus::bus::bus& bus;