diff --git a/src/FileHashChecker.php b/src/FileHashChecker.php
index 7756f38..953c681 100644
--- a/src/FileHashChecker.php
+++ b/src/FileHashChecker.php
@@ -2,6 +2,7 @@
 
 namespace Rcsofttech85\FileHandler;
 
+use Rcsofttech85\FileHandler\Exception\FileHandlerException;
 use Rcsofttech85\FileHandler\Exception\HashException;
 use Rcsofttech85\FileHandler\Validator\FileValidatorTrait;
 
@@ -9,46 +10,47 @@ class FileHashChecker
 {
     use FileValidatorTrait;
 
+
     public const ALGO_256 = 'sha3-256';
     public const ALGO_512 = 'sha3-512';
 
+    private const SEARCH_COLUMN_NAME = 'File';
+    private const SEARCH_COLUMN_VALUE = 'Hash';
+
+
     /**
-     * @param string $filename
      * @param CsvFileHandler $csvFileHandler
-     * @throws Exception\FileHandlerException
      */
-    public function __construct(private string $filename, private readonly CsvFileHandler $csvFileHandler)
+    public function __construct(private readonly CsvFileHandler $csvFileHandler)
     {
-        $this->filename = $this->validateFileName($filename);
     }
 
     /**
-     * @param string $storedHashesFile
+     * @param string $filename
      * @param string $algo
      * @return bool
-     * @throws Exception\FileHandlerException
+     * @throws FileHandlerException
      * @throws HashException
      */
 
-    public function verifyHash(string $storedHashesFile, string $algo = self::ALGO_256): bool
+    public function verifyHash(string $filename, string $algo = self::ALGO_256): bool
     {
-        if (!$storedHashesFile) {
-            throw new HashException('file not found');
-        }
-
+        $storedHashesFile = $this->getParameter(self::STORED_HASH_FILE);
         $file = $this->csvFileHandler->searchInCsvFile(
             filename: $storedHashesFile,
-            keyword: $this->filename,
-            column: 'File',
+            keyword: $filename,
+            column: self::SEARCH_COLUMN_NAME,
             format: FileHandler::ARRAY_FORMAT
         );
 
+
         if (!$file || !is_array($file)) {
             throw new HashException('this file is not hashed');
         }
 
         $expectedHash = $file['Hash'];
-        $hash = $this->hashFile($algo);
+        $hash = $this->hashFile($filename, $algo);
+
 
         if ($hash !== $expectedHash) {
             return false;
@@ -58,16 +60,65 @@ public function verifyHash(string $storedHashesFile, string $algo = self::ALGO_2
     }
 
     /**
+     * @param string $filename
      * @param string $algo
      * @return string
-     * @throws HashException
+     * @throws HashException|FileHandlerException
      */
 
-    public function hashFile(string $algo = self::ALGO_256): string
+    public function hashFile(string $filename, string $algo = self::ALGO_256): string
     {
+        $this->validateFileName($filename);
         if (!in_array($algo, [self::ALGO_512, self::ALGO_256])) {
             throw new HashException('algorithm not supported');
         }
-        return hash_file($algo, $this->filename);
+
+        if (!$hash = hash_file($algo, $filename)) {
+            throw new HashException('could not hash file');
+        }
+
+        $storedHashesFile = $this->getParameter(self::STORED_HASH_FILE);
+
+
+        $file = fopen($storedHashesFile, 'a+');
+        if (!$file) {
+            throw new FileHandlerException('file not found');
+        }
+        $this->checkHeaderExists($file);
+
+
+        try {
+            $filenameExists = $this->csvFileHandler->searchInCsvFile(
+                filename: $storedHashesFile,
+                keyword: $filename,
+                column: 'File'
+            );
+
+            if (!$filenameExists) {
+                fputcsv($file, [$filename, $hash]);
+            }
+        } catch (FileHandlerException) {
+            fputcsv($file, [$filename, $hash]);
+        } finally {
+            fclose($file);
+        }
+
+
+        return $hash;
+    }
+
+    /**
+     * @param mixed $storedHashFile
+     * @return void
+     */
+    private function checkHeaderExists(mixed $storedHashFile): void
+    {
+        $header = fgetcsv($storedHashFile);
+
+        if (!$header || $header[0] !== self::SEARCH_COLUMN_NAME || $header[1] !== self::SEARCH_COLUMN_VALUE) {
+            fseek($storedHashFile, 0);
+            fputcsv($storedHashFile, [self::SEARCH_COLUMN_NAME, self::SEARCH_COLUMN_VALUE]);
+            fflush($storedHashFile);
+        }
     }
 }
diff --git a/src/config/services.yaml b/src/config/services.yaml
index 19cef37..76eba7a 100644
--- a/src/config/services.yaml
+++ b/src/config/services.yaml
@@ -1,7 +1,7 @@
 parameters:
   filename: 'movie.csv'
   secret: 'password'
-  hash_file_name: 'test'
+
 
 
 
@@ -22,7 +22,7 @@ services:
 
   file_hash:
     class: 'Rcsofttech85\FileHandler\FileHashChecker'
-    arguments: [ '%filename%','@csv_file_handler' ]
+    arguments: [ '@csv_file_handler' ]
 
   json_file_handler:
     class: 'Rcsofttech85\FileHandler\JsonFileHandler'
diff --git a/tests/unit/FileHashCheckerTest.php b/tests/unit/FileHashCheckerTest.php
index 23a66fb..e0c85bb 100644
--- a/tests/unit/FileHashCheckerTest.php
+++ b/tests/unit/FileHashCheckerTest.php
@@ -10,7 +10,6 @@
 
 class FileHashCheckerTest extends BaseTest
 {
-    private static string $file;
     private FileHashChecker|null $fileHash = null;
 
 
@@ -31,30 +30,27 @@ public static function setUpBeforeClass(): void
     {
         parent::setUpBeforeClass();
 
-        $file = self::$containerBuilder->getParameter('STORED_HASH_FILE');
-        if (is_string($file)) {
-            self::$file = $file;
-        }
         static::$files[] = 'sample';
     }
 
 
     /**
      * @throws HashException
+     * @throws FileHandlerException
      */
     #[Test]
     public function shouldGenerateValidHashForDifferentAlgo(): void
     {
         $expectedHash = "5923032f7e18edf69e1a3221be3205ce658ec0e4fb274016212a09a804240683";
 
-        $actualHash = $this->fileHash->hashFile(); //default ALGO_256
+        $actualHash = $this->fileHash->hashFile(filename: 'movie.csv'); //default ALGO_256
 
         $this->assertEquals($expectedHash, $actualHash);
 
         $expectedHash = "1050bcc2d7d840d634f067a22abb4cd693b1f2590849982e29a6f9bb28963f733" .
             "92b63ea24ae17edfaa500ee62b9e5482b9648af0b2b7d941992af3b0f9cbd3b";
 
-        $actualHash = $this->fileHash->hashFile(FileHashChecker::ALGO_512);
+        $actualHash = $this->fileHash->hashFile(filename: 'movie.csv', algo: FileHashChecker::ALGO_512);
 
         $this->assertEquals($expectedHash, $actualHash);
     }
@@ -66,7 +62,7 @@ public function shouldGenerateValidHashForDifferentAlgo(): void
     #[Test]
     public function checkFileIntegrityReturnsTrueIfHashMatch(): void
     {
-        $isVerified = $this->fileHash->verifyHash(storedHashesFile: self::$file);
+        $isVerified = $this->fileHash->verifyHash(filename: 'movie.csv');
 
         $this->assertTrue($isVerified);
     }
@@ -81,7 +77,7 @@ public function shouldReturnFalseIfFileIsModified(): void
         $backup = file_get_contents("movie.csv");
         file_put_contents("movie.csv", "modified", FILE_APPEND);
 
-        $isVerified = $this->fileHash->verifyHash(self::$file);
+        $isVerified = $this->fileHash->verifyHash('movie.csv');
 
         $this->assertfalse($isVerified);
 
@@ -95,8 +91,24 @@ public function shouldReturnFalseIfFileIsModified(): void
     #[Test]
     public function shouldReturnFalseIfDifferentAlgoIsUsedForVerifyHash(): void
     {
-        $isVerified = $this->fileHash->verifyHash(self::$file, FileHashChecker::ALGO_512);
+        $isVerified = $this->fileHash->verifyHash('movie.csv', FileHashChecker::ALGO_512);
 
         $this->assertFalse($isVerified);
     }
+
+    /**
+     * @throws HashException
+     * @throws FileHandlerException
+     */
+    #[Test]
+    public function shouldAddRecordIfNewFileIsHashed(): void
+    {
+        file_put_contents('sample', "hello");
+
+        $this->fileHash->hashFile('sample', FileHashChecker::ALGO_512);
+
+        $isVerified = $this->fileHash->verifyHash('sample', FileHashChecker::ALGO_512);
+
+        $this->assertTrue($isVerified);
+    }
 }