src/Form/JsonApiSettingsForm.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Form/JsonApiSettingsForm.php b/src/Form/JsonApiSettingsForm.php
index ded0f12..6f720e7 100644
--- a/src/Form/JsonApiSettingsForm.php
+++ b/src/Form/JsonApiSettingsForm.php
@@ -37,8 +37,8 @@ class JsonApiSettingsForm extends ConfigFormBase {
       '#title' => $this->t('Enable read-only mode'),
       '#title_display' => 'invisible',
       '#options' => [
-        'r' => $this->t('Allow only reading'),
-        'rw' => $this->t('Allow reading and writing'),
+        'r' => $this->t('Allow only reading.'),
+        'rw' => $this->t('Allow reading and writing.'),
       ],
       '#default_value' => $jsonapi_config->get('read_only') === TRUE ? 'r' : 'rw',
       '#description' => $this->t('When writing is allowed, entities (content items, taxonomy terms, …) can be added, changed, or removed via JSON:API. <a href=":docs">This may have security implications.</a>', [':docs' => 'https://www.drupal.org/docs/8/modules/jsonapi/security-considerations']),
@@ -52,7 +52,7 @@ class JsonApiSettingsForm extends ConfigFormBase {
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $this->config('jsonapi.settings')
-      ->set('read_only', $form_state->getValue('read_only'))
+      ->set('read_only', $form_state->getValue('read_only') === 'r')
       ->save();
 
     parent::submitForm($form, $form_state);