diff --git a/extensions/openpower-pels/host_notifier.cpp b/extensions/openpower-pels/host_notifier.cpp
index f2d951f..b4e92a8 100644
--- a/extensions/openpower-pels/host_notifier.cpp
+++ b/extensions/openpower-pels/host_notifier.cpp
@@ -345,4 +345,16 @@
     }
 }
 
+void HostNotifier::ackPEL(uint32_t id)
+{
+    _repo.setPELHostTransState(id, TransmissionState::acked);
+
+    // No longer just 'sent', so remove it from the sent list.
+    auto sent = std::find(_sentPELs.begin(), _sentPELs.end(), id);
+    if (sent != _sentPELs.end())
+    {
+        _sentPELs.erase(sent);
+    }
+}
+
 } // namespace openpower::pels
diff --git a/extensions/openpower-pels/host_notifier.hpp b/extensions/openpower-pels/host_notifier.hpp
index 3e50c83..d160dd4 100644
--- a/extensions/openpower-pels/host_notifier.hpp
+++ b/extensions/openpower-pels/host_notifier.hpp
@@ -82,6 +82,15 @@
      */
     bool notifyRequired(uint32_t id) const;
 
+    /**
+     * @brief Called when the host sends the 'ack' PLDM command.
+     *
+     * This means the PEL never needs to be sent up again.
+     *
+     * @param[in] id - The PEL ID
+     */
+    void ackPEL(uint32_t id);
+
   private:
     /**
      * @brief This function gets called by the Repository class