diff --git a/README.md b/README.md
index 8b28e75c..19ee9090 100644
--- a/README.md
+++ b/README.md
@@ -82,17 +82,30 @@ use Bakame\Csv\Reader;
 use Bakame\Csv\Writer;
 
 $reader = new Reader('/path/to/your/csv/file.csv');
-$reader = new Reader(new SpliFileInfo('/path/to/your/csv/file.csv'));
+$reader = new Reader(new SpliFileInfo('/path/to/your/csv/file.csv'), 'rt');
 $reader = Reader::createFromString('john,doe,john.doe@example.com');
 
 //or 
 
-$writer = new Writer('/path/to/your/csv/file.csv', 'w');
-$writer = new Writer(new SpliFileObject('/path/to/your/csv/file.csv'), 'a+');
+$writer = new Writer('/path/to/your/csv/file.csv', 'ab+');
+$writer = new Writer(new SpliFileObject('/path/to/your/csv/file.csv'));
 $writer = Writer::createFromString('john,doe,john.doe@example.com');
 ```
 
-Both classes constructors take one optional parameter `$open_mode` representing the file open mode used by the PHP [fopen](http://php.net/manual/en/function.fopen.php) function. 
+Both classes constructors take one optional parameter `$open_mode` representing the file open mode used by the PHP [fopen](http://php.net/manual/en/function.fopen.php) function.
+
+The `$open_mode` parameter is taken into account if you instantiate your object with:
+
+* a `SplFileInfo`
+* a string path
+
+The `$open_mode` parameter is **ignore** if you instantiate your object with:
+
+* a `SplFileObject`
+* a `SplTempFileObject`
+
+When not explicitly set:
+
 * The `Bakame\Csv\Writer` `$open_mode` default value is `w`.
 * The `Bakame\Csv\Reader` `$open_mode` default value is `r`.
 
diff --git a/src/AbstractCsv.php b/src/AbstractCsv.php
index 6c1b258b..4f1582e2 100644
--- a/src/AbstractCsv.php
+++ b/src/AbstractCsv.php
@@ -166,7 +166,7 @@ public static function isValidString($str)
      */
     protected function fetchFile($path, $open_mode)
     {
-        if ($path instanceof SplTempFileObject) {
+        if ($path instanceof SplFileObject) {
             return $path;
         }
         $open_mode = strtolower($open_mode);
diff --git a/src/Reader.php b/src/Reader.php
index 8d82c031..a8d6432e 100644
--- a/src/Reader.php
+++ b/src/Reader.php
@@ -32,6 +32,8 @@
 */
 namespace Bakame\Csv;
 
+use SplFileObject;
+use SplTempFileObject;
 use InvalidArgumentException;
 use CallbackFilterIterator;
 use Bakame\Csv\Iterator\MapIterator;
@@ -194,7 +196,11 @@ public function fetchCol($columnIndex = 0, callable $callable = null)
      */
     public function getWriter($open_mode = 'w')
     {
-        $csv = new Writer($this->csv, $open_mode);
+        $obj = $this->csv;
+        if (! $obj instanceof SplTempFileObject) {
+            $obj = new SplFileObject($obj->getRealPath(), $open_mode);
+        }
+        $csv = new Writer($obj);
         $csv->setDelimiter($this->delimiter);
         $csv->setEnclosure($this->enclosure);
         $csv->setEscape($this->escape);
diff --git a/test/ReaderTest.php b/test/ReaderTest.php
index 25d02415..8353593d 100644
--- a/test/ReaderTest.php
+++ b/test/ReaderTest.php
@@ -161,4 +161,10 @@ public function testGetWriter()
 EOF;
         $this->assertSame($expected, $writer->toHTML());
     }
+
+    public function testGetWriter2()
+    {
+        $csv = (new Reader(__DIR__.'/foo.csv'))->getWriter('a+');
+        $this->assertInstanceOf('\Bakame\Csv\Writer', $csv);
+    }
 }