diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/MapItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/MapItem.php
index b5795a5..ad44c81 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/MapItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/MapItem.php
@@ -27,8 +27,8 @@ class MapItem extends FieldItemBase {
    * {@inheritdoc}
    */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
-    // The properties are dynamic and can not be defined statically, but we
-    // allow to set some properties on the field definition if they are known.
+    // The properties are dynamic and can not be defined statically. However, we
+    // allow setting some definitions on the field definition if they are known.
     return $field_definition->getSetting('property_definitions') ?: array();
   }
 
@@ -51,8 +51,8 @@ public static function schema(FieldStorageDefinitionInterface $field_definition)
    * {@inheritdoc}
    */
   public function toArray() {
-    // The default implementation of toArray() only returns known properties
-    // return everything instead for a map as the properties are not defined.
+    // The default implementation of toArray() only returns known properties.
+    // For a map, return everything as the properties are not pre-defined.
     return $this->getValue();
   }