diff --git a/google_vision.module b/google_vision.module
index 551e03b..cda9bec 100644
--- a/google_vision.module
+++ b/google_vision.module
@@ -2,6 +2,7 @@
 
 /**
  * @file
+ * Implements the Google Cloud Vision API properties.
  */
 
 use Drupal\Core\Form\FormStateInterface;
@@ -11,6 +12,7 @@ use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\taxonomy\Entity\Vocabulary;
+
 /**
  * Implements hook_entity_presave().
  */
@@ -38,7 +40,7 @@ function google_vision_entity_presave(EntityInterface $entity) {
             $vocabularies = Vocabulary::loadMultiple();
             // Create a vocabulary if not already present.
             if (!isset($vocabularies[$new_vid])) {
-              $vocabulary = \Drupal\taxonomy\Entity\Vocabulary::create(array(
+              $vocabulary = Vocabulary::create(array(
                 'vid' => $new_vid,
                 'machine_name' => $new_vid,
                 'name' => $name,
@@ -125,6 +127,8 @@ function google_vision_form_field_config_form_image_builder($entity_type, FieldC
  * values in files.
  */
 function google_vision_add_terms_to_vocabulary($file, $field, $vid, $labels) {
+  // Initialize the values array.
+  $values = [];
   // Get existing values from field.
   $values = $file->get($field->getName())->getValue();
   $taxonomy_term_storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
diff --git a/src/Controller/SimilarContentController.php b/src/Controller/SimilarContentController.php
index e16df87..27dd88e 100644
--- a/src/Controller/SimilarContentController.php
+++ b/src/Controller/SimilarContentController.php
@@ -16,6 +16,7 @@ use Drupal\Core\Database\Connection;
  * Returns the related content based on dominant color of the images.
  */
 class SimilarContentController extends ControllerBase {
+
   /**
    * Database Service Object.
    *
@@ -32,6 +33,12 @@ class SimilarContentController extends ControllerBase {
 
   /**
    * Get the file title.
+   *
+   * @param integer $fid.
+   *  The file id.
+   *
+   * @return string $title.
+   *  The title of the file id passed.
    */
   public function getFileTitle($fid) {
     $query = $this->connection->select('file_managed', 'fm');
@@ -43,6 +50,12 @@ class SimilarContentController extends ControllerBase {
 
   /**
    * Returns the list of image links which share the same dominant color.
+   *
+   * @param \Drupal\file\FileInterface $file.
+   *  The file of which the similar contents are to be displayed.
+   *
+   * @return array $build.
+   *  The rendered list of items to be displayed.
    */
   public function fetchContent(FileInterface $file) {
     // Get the file id.