diff --git a/src/fsfw/internalerror/InternalErrorReporterIF.h b/src/fsfw/internalerror/InternalErrorReporterIF.h
index 9eb8e7d7..61bb52e7 100644
--- a/src/fsfw/internalerror/InternalErrorReporterIF.h
+++ b/src/fsfw/internalerror/InternalErrorReporterIF.h
@@ -1,22 +1,34 @@
 #ifndef INTERNALERRORREPORTERIF_H_
 #define INTERNALERRORREPORTERIF_H_
 
+/**
+ * @brief   Interface which is used to report internal errors like full message queues or stores.
+ * @details
+ * This interface smust be used for the InteralErrorReporter object.
+ * It should be used to indicate that there was a Problem with Queues or Stores.
+ *
+ * It can be used to report missing Telemetry which could not be sent due to a internal problem.
+ *
+ */
 class InternalErrorReporterIF {
  public:
   virtual ~InternalErrorReporterIF() {}
-
   /**
-   * Thread safe
+   * @brief Function to be called if a message queue could not be sent.
+   * @details OSAL Implementations should call this function to indicate that
+   * a message was lost.
+   *
+   *  Implementations are required to be Thread safe
    */
   virtual void queueMessageNotSent() = 0;
-
   /**
-   * Thread safe
+   * @brief Function to be called if Telemetry could not be sent
+   * @details Implementations must be Thread safe
    */
   virtual void lostTm() = 0;
-
   /**
-   * Thread safe
+   * @brief Function to be called if a onboard storage is full
+   * @details Implementations must be Thread safe
    */
   virtual void storeFull() = 0;
 };
diff --git a/tests/src/fsfw_tests/unit/internalerror/TestInternalErrorReporter.cpp b/tests/src/fsfw_tests/unit/internalerror/TestInternalErrorReporter.cpp
index a7f5e109..92c3ff22 100644
--- a/tests/src/fsfw_tests/unit/internalerror/TestInternalErrorReporter.cpp
+++ b/tests/src/fsfw_tests/unit/internalerror/TestInternalErrorReporter.cpp
@@ -98,6 +98,20 @@ TEST_CASE("Internal Error Reporter", "[TestInternalError]") {
       REQUIRE(dataset.tmHits.value == (lostTm + 1));
       REQUIRE(dataset.storeHits.value == (storeHits + 1));
     }
+    // Complete Coverage
+    internalErrorReporter->setDiagnosticPrintout(true);
+    internalErrorReporter->setMutexTimeout(MutexIF::TimeoutType::BLOCKING, 0);
+    {
+      // Message Queue Id
+      MessageQueueId_t id = internalErrorReporter->getCommandQueue();
+      REQUIRE(id != MessageQueueIF::NO_QUEUE);
+      CommandMessage message;
+      sid_t sid(objects::INTERNAL_ERROR_REPORTER, InternalErrorDataset::ERROR_SET_ID);
+      HousekeepingMessage::setToggleReportingCommand(&message, sid, true, false);
+      result = hkQueue->sendMessage(id, &message);
+      REQUIRE(result == HasReturnvaluesIF::RETURN_OK);
+      internalErrorReporter->performOperation(0);
+    }
   }
   QueueFactory::instance()->deleteMessageQueue(testQueue);
   QueueFactory::instance()->deleteMessageQueue(hkQueue);