diff --git a/README.md b/README.md
index 1fcfb80..a20905e 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ Read the CSV file
 ------------------------------------------------------
 
 ```hack
+use hhpack\file\FileReader;
 use hhpack\file\SeparatedFileReader;
 use hhpack\file\ColumnSpecification;
 
@@ -41,14 +42,15 @@ $spec = new ColumnSpecification(',', '"');
 $spec->addColumn(0, 'name');
 $spec->addColumn(1, 'description');
 
-$reader = SeparatedFileReader::fromString(__DIR__ . '/example.csv');
+$reader = FileReader::fromString(__DIR__ . '/example.csv');
+$csvReader = new SeparatedFileReader($reader, $spec);
 
-foreach ($reader->records($spec) as $record) {
+foreach ($csvReader->records() as $record) {
     echo $record->get('name'), "\n";
     echo $record->get('description'), "\n";
 }
 
-$reader->close();
+$csvReader->close();
 ```
 
 Customizing the reading of the record
@@ -58,6 +60,7 @@ Will create a parser that implements the **ParseSpecification**.
 Then use the **ParsedFileReader**, and then apply the parser.
 
 ```hack
+use hhpack\file\FileReader;
 use hhpack\file\ParsedFileReader;
 use hhpack\file\ParseSpecification;
 
@@ -70,9 +73,10 @@ final class CustomRecordSpecification implements ParseSpecification<array<string
 }
 
 $spec = new CustomRecordSpecification();
-$reader = ParsedFileReader::fromString(__DIR__ . '/example.csv');
+$reader = FileReader::fromString(__DIR__ . '/example.csv');
+$csvReader = new ParsedFileReader($reader, $spec);
 
-foreach ($reader->records($spec) as $values) {
+foreach ($csvReader->records() as $values) {
     echo $values[0], "\n";
     echo $values[1], "\n";
 }
diff --git a/spec/SeparatedFileReaderSpec.hh b/spec/SeparatedFileReaderSpec.hh
index 40566d7..e6e9051 100644
--- a/spec/SeparatedFileReaderSpec.hh
+++ b/spec/SeparatedFileReaderSpec.hh
@@ -1,6 +1,7 @@
 <?hh //partial
 
 use hhpack\file\File;
+use hhpack\file\FileReader;
 use hhpack\file\ColumnSpecification;
 use hhpack\file\SeparatedFileReader;
 
@@ -12,8 +13,8 @@ describe(SeparatedFileReader::class, function() {
     $spec->addColumn(1, 'title');
 
     $this->spec = $spec;
-    $this->path = realpath(__DIR__ . '/fixtures/text.csv');
-    $this->reader = SeparatedFileReader::fromString($this->path);
+    $this->fileReader = FileReader::fromString(realpath(__DIR__ . '/fixtures/text.csv'));
+    $this->reader = new SeparatedFileReader($this->fileReader, $this->spec);
   });
   describe('#fromString()', function() {
     it('return file reader', function() {
@@ -23,7 +24,7 @@ describe(SeparatedFileReader::class, function() {
   describe('#records()', function() {
     beforeEach(function() {
       $concatValue = '';
-      $records = $this->reader->records($this->spec);
+      $records = $this->reader->records();
 
       foreach ($records as $record) {
         $concatValue .= (string) $record->get('name');
@@ -31,7 +32,7 @@ describe(SeparatedFileReader::class, function() {
       }
       $this->concatValue = $concatValue;
     });
-    it('return Generator<int, SeparatedRecord, void>', function() {
+    it('return Iterator<SeparatedRecord>', function() {
       expect($this->concatValue)->toBe("foo1bar1foo2bar2");
     });
   });
diff --git a/src/ParsedFileReader.hh b/src/ParsedFileReader.hh
index 8a86d62..da1095a 100644
--- a/src/ParsedFileReader.hh
+++ b/src/ParsedFileReader.hh
@@ -16,23 +16,17 @@ use \Generator;
 final class ParsedFileReader<T>
 {
 
-    private FileReader $reader;
-
-    public function __construct(FileReader $reader)
-    {
-        $this->reader = $reader;
-    }
-
-    public static function fromString(string $filePath) : ParsedFileReader<T>
+    public function __construct(
+        private FileReader $reader,
+        private ParseSpecification<T> $spec
+    )
     {
-        $reader = FileReader::fromString($filePath);
-        return new self($reader);
     }
 
-    public function records(ParseSpecification<T> $spec) : Generator<int, T, void>
+    public function records() : Iterator<T>
     {
         foreach ($this->reader->lines() as $line) {
-            yield $spec->parse($line);
+            yield $this->spec->parse($line);
         }
     }
 
diff --git a/src/SeparatedFileReader.hh b/src/SeparatedFileReader.hh
index c8092d7..060644e 100644
--- a/src/SeparatedFileReader.hh
+++ b/src/SeparatedFileReader.hh
@@ -19,20 +19,17 @@ final class SeparatedFileReader
 
     private ParsedFileReader<SeparatedRecord> $reader;
 
-    public function __construct(FileReader $reader)
+    public function __construct(
+        FileReader $reader,
+        ColumnSpecification $spec
+    )
     {
-        $this->reader = new ParsedFileReader($reader);
+        $this->reader = new ParsedFileReader($reader, $spec);
     }
 
-    public static function fromString(string $filePath) : SeparatedFileReader
+    public function records() : Iterator<SeparatedRecord>
     {
-        $reader = FileReader::fromString($filePath);
-        return new self($reader);
-    }
-
-    public function records(ColumnSpecification $spec) : Generator<int, SeparatedRecord, void>
-    {
-        return $this->reader->records($spec);
+        return $this->reader->records();
     }
 
     public function close() : void