diff --git a/src/Document.php b/src/Document.php
index <HASH>..<HASH> 100644
--- a/src/Document.php
+++ b/src/Document.php
@@ -79,11 +79,11 @@ class Document implements JsonSerializable
 
             foreach ($resource->getUnfilteredRelationships() as $relationship) {
                 $includedElement = $relationship->getData();
-                
-                if (!$includedElement instanceof ElementInterface) {
+
+                if (! $includedElement instanceof ElementInterface) {
                     continue;
                 }
-                
+
                 foreach ($this->getIncluded($includedElement, true) as $child) {
                     // If this resource is the same as the top-level "data"
                     // resource, then we don't want it to show up again in the
Corrected styling from StyleCI analysis on tobscure/json-api PR