diff --git a/lib/Drupal/migrate/MigrateMessage.php b/lib/Drupal/migrate/MigrateMessage.php
index d90297e..fa58821 100644
--- a/lib/Drupal/migrate/MigrateMessage.php
+++ b/lib/Drupal/migrate/MigrateMessage.php
@@ -19,6 +19,11 @@ class MigrateMessage implements MigrateMessageInterface {
    *   The message to display.
    * @param string $type
    *   The type of message, for example: status or warning.
+   *
+   * @return array|null
+   *   A multidimensional array with keys corresponding to the set message types.
+   *   The indexed array values of each contain the set messages for that type.
+   *   Or, if there are no messages set, the function returns NULL.
    */
   function display($message, $type = 'status') {
     drupal_set_message($message, $type);
diff --git a/lib/Drupal/migrate/Row.php b/lib/Drupal/migrate/Row.php
index f4ddc7b..4061c08 100644
--- a/lib/Drupal/migrate/Row.php
+++ b/lib/Drupal/migrate/Row.php
@@ -117,6 +117,7 @@ class Row {
     if (isset($this->source[$property])) {
       return $this->source[$property];
     }
+    return NULL;
   }
 
   /**
@@ -158,6 +159,9 @@ class Row {
   /**
    * @param array $property_keys
    *   An array of properties on the destination.
+   *
+   * @return bool
+   *   Return TRUE if we can find the given destination property.
    */
   public function hasDestinationProperty($property) {
     return NestedArray::keyExists($this->destination, explode(':', $property));