diff --git a/README.txt b/README.txt
index aa19bf0..b1d8de6 100644
--- a/README.txt
+++ b/README.txt
@@ -2,9 +2,17 @@ Simple Google Maps module
 
 This module is about the simplest way to get a Google Map, or a link to a
 Google Map, displayed with your content. It simply provides a field formatter
-for Drupal 8 text fields. With this formatter, you can enter a single-line
-address that Google Maps would recognize into a plain text field, such as:
+for Drupal 8 plain text fields.
+
+Applying this formatter to a single-line unformatted text field, you can enter a
+single-line address that Google Maps would recognize into a plain text field,
+such as:
    100 Madison Ave, New York, NY
+You can also use an unformatted long text field to enter a multiple-line
+address, such as:
+   100 madison Ave
+   New York, NY
+
 And then on your Manage Display screen (or in Views field setup), you can choose
 to display the field with an embedded iframe Google Map, a link to a Google Maps
 map, or both; with or without the original address text.
diff --git a/src/Plugin/Field/FieldFormatter/SimpleGMapFormatter.php b/src/Plugin/Field/FieldFormatter/SimpleGMapFormatter.php
index 184e12d..365197f 100644
--- a/src/Plugin/Field/FieldFormatter/SimpleGMapFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/SimpleGMapFormatter.php
@@ -14,6 +14,7 @@ use Drupal\Core\Form\FormStateInterface;
  *   label = @Translation("Google Map from one-line address"),
  *   field_types = {
  *     "string",
+ *     "string_long",
  *     "computed",
  *     "computed_string",
  *   }
diff --git a/src/Tests/SimpleGmapTest.php b/src/Tests/SimpleGmapTest.php
index 11e9170..c828650 100644
--- a/src/Tests/SimpleGmapTest.php
+++ b/src/Tests/SimpleGmapTest.php
@@ -103,7 +103,7 @@ class SimpleGmapTest extends WebTestBase {
 
     $this->drupalGet('admin/structure/types/manage/article/fields/add-field');
     $this->drupalPostForm(NULL, [
-      'new_storage_type' => 'string',
+      'new_storage_type' => 'string_long',
     ], 'Save and continue');
     $this->drupalPostForm(NULL, [
       'label' => $field3,