diff --git a/samples/Sample_Header.php b/samples/Sample_Header.php
index 04fd8a40..c79aee32 100644
--- a/samples/Sample_Header.php
+++ b/samples/Sample_Header.php
@@ -16,7 +16,8 @@ $writers = array('Word2007' => 'docx', 'ODText' => 'odt', 'RTF' => 'rtf', 'HTML'
 
 // Set PDF renderer
 $rendererName = \PhpOffice\PhpWord\Settings::PDF_RENDERER_DOMPDF;
-$rendererLibraryPath = ""; // Put dompdf library path
+$rendererLibraryPath = ''; // DomPDF library path
+
 if (!\PhpOffice\PhpWord\Settings::setPdfRenderer($rendererName, $rendererLibraryPath)) {
     $writers['PDF'] = null;
 }
diff --git a/src/PhpWord/Writer/PDF.php b/src/PhpWord/Writer/PDF.php
index ee184056..7421e3e4 100644
--- a/src/PhpWord/Writer/PDF.php
+++ b/src/PhpWord/Writer/PDF.php
@@ -21,7 +21,7 @@ class PDF
     /**
      * The wrapper for the requested PDF rendering engine
      *
-     * @var \PhpOffice\PhpWord\Writer\PDF\Core
+     * @var \PhpOffice\PhpWord\Writer\PDF\AbstractRenderer
      */
     private $renderer = null;
 
diff --git a/src/PhpWord/Writer/PDF/Core.php b/src/PhpWord/Writer/PDF/AbstractRenderer.php
similarity index 96%
rename from src/PhpWord/Writer/PDF/Core.php
rename to src/PhpWord/Writer/PDF/AbstractRenderer.php
index 82b687a2..3ee96966 100644
--- a/src/PhpWord/Writer/PDF/Core.php
+++ b/src/PhpWord/Writer/PDF/AbstractRenderer.php
@@ -9,13 +9,13 @@
 
 namespace PhpOffice\PhpWord\Writer\PDF;
 
+use PhpOffice\PhpWord\Exception\Exception;
 use PhpOffice\PhpWord\PhpWord;
-use PhpOffice\PhpWord\PhpWord\Exception\Exception;
 
 /**
- * Core PDF Writer
+ * Abstract PDF renderer
  */
-abstract class Core extends \PhpOffice\PhpWord\Writer\HTML
+abstract class AbstractRenderer extends \PhpOffice\PhpWord\Writer\HTML
 {
     /**
      * Temporary storage directory
diff --git a/src/PhpWord/Writer/PDF/DomPDF.php b/src/PhpWord/Writer/PDF/DomPDF.php
index 48326ea3..a5db2d99 100644
--- a/src/PhpWord/Writer/PDF/DomPDF.php
+++ b/src/PhpWord/Writer/PDF/DomPDF.php
@@ -11,7 +11,7 @@ namespace PhpOffice\PhpWord\Writer\PDF;
 
 use PhpOffice\PhpWord\PhpWord;
 use PhpOffice\PhpWord\Settings;
-use PhpOffice\PhpWord\PhpWord\Exception\Exception;
+use PhpOffice\PhpWord\Exception\Exception;
 
 /** Require DomPDF library */
 $pdfRendererClassFile = Settings::getPdfRendererPath() . '/dompdf_config.inc.php';
@@ -24,7 +24,7 @@ if (file_exists($pdfRendererClassFile)) {
 /**
  * DomPDF writer
  */
-class DomPDF extends Core implements \PhpOffice\PhpWord\Writer\WriterInterface
+class DomPDF extends AbstractRenderer implements \PhpOffice\PhpWord\Writer\WriterInterface
 {
     /**
      * Create new instance