diff --git a/src/Spout/Writer/AbstractMultiSheetsWriter.php b/src/Spout/Writer/AbstractMultiSheetsWriter.php
index 9e145dd..8e1114d 100644
--- a/src/Spout/Writer/AbstractMultiSheetsWriter.php
+++ b/src/Spout/Writer/AbstractMultiSheetsWriter.php
@@ -16,7 +16,7 @@ abstract class AbstractMultiSheetsWriter extends AbstractWriter
     protected $shouldCreateNewSheetsAutomatically = true;
 
     /**
-     * @return Common\WorkbookInterface The workbook representing the file to be written
+     * @return Common\Internal\WorkbookInterface The workbook representing the file to be written
      */
     abstract protected function getWorkbook();
 
@@ -49,7 +49,7 @@ abstract class AbstractMultiSheetsWriter extends AbstractWriter
         $externalSheets = [];
         $worksheets = $this->getWorkbook()->getWorksheets();
 
-        /** @var Common\WorksheetInterface $worksheet */
+        /** @var Common\Internal\WorksheetInterface $worksheet */
         foreach ($worksheets as $worksheet) {
             $externalSheets[] = $worksheet->getExternalSheet();
         }
diff --git a/src/Spout/Writer/ODS/Internal/Workbook.php b/src/Spout/Writer/ODS/Internal/Workbook.php
index 5d4a9bf..ce24f2f 100644
--- a/src/Spout/Writer/ODS/Internal/Workbook.php
+++ b/src/Spout/Writer/ODS/Internal/Workbook.php
@@ -18,7 +18,7 @@ class Workbook extends AbstractWorkbook
 {
     /**
      * Maximum number of rows a ODS sheet can contain
-     * @see http://office.microsoft.com/en-us/excel-help/excel-specifications-and-limits-HP010073849.aspx
+     * @see https://ask.libreoffice.org/en/question/8631/upper-limit-to-number-of-rows-in-calc/
      */
     protected static $maxRowsPerWorksheet = 1048576;