diff --git a/readme.md b/readme.md
index fb65774..0212acc 100644
--- a/readme.md
+++ b/readme.md
@@ -15,7 +15,14 @@ $helper = new Cz\PathsHelper;
 $helper->absolutizePath('path/to/my/../text/./file.txt');
 ```
 
-Returns ```path/to/text/file.txt```
+Returns ```/path/to/text/file.txt```
+
+You can use second parameters ```$prefix```:
+
+``` php
+$helper->absolutizePath('path/to/my/../text/./file.txt', NULL); // returns path/to/text/file.txt
+$helper->absolutizePath('path/to/my/../text/./file.txt', '/file/root/'); // returns /file/root/path/to/text/file.txt
+```
 
 
 ### Generating relative paths
diff --git a/src/PathsHelper.php b/src/PathsHelper.php
index 40cdc46..c162b91 100644
--- a/src/PathsHelper.php
+++ b/src/PathsHelper.php
@@ -105,7 +105,7 @@ public function isPathCurrent($currentPath, $mask)
 		 * @param  string
 		 * @return string
 		 */
-		public function absolutizePath($path)
+		public function absolutizePath($path, $prefix = '/')
 		{
 			$path = explode('/', $path);
 			$buffer = array();
@@ -120,6 +120,6 @@ public function absolutizePath($path)
 				}
 			}
 
-			return implode('/', $buffer);
+			return $prefix . implode('/', $buffer);
 		}
 	}
diff --git a/tests/PathsHelper/PathsHelper.absolutizePath.phpt b/tests/PathsHelper/PathsHelper.absolutizePath.phpt
index be86449..dd773ef 100644
--- a/tests/PathsHelper/PathsHelper.absolutizePath.phpt
+++ b/tests/PathsHelper/PathsHelper.absolutizePath.phpt
@@ -6,15 +6,15 @@ require __DIR__ . '/../../src/PathsHelper.php';
 
 $h = new Cz\PathsHelper;
 
-Assert::same('', $h->absolutizePath(''));
-Assert::same('', $h->absolutizePath('..'));
-Assert::same('', $h->absolutizePath('.'));
+Assert::same('/', $h->absolutizePath(''));
+Assert::same('/', $h->absolutizePath('..'));
+Assert::same('/', $h->absolutizePath('.'));
 
-Assert::same('lorem/ipsum/dolor/sit', $h->absolutizePath('lorem/ipsum/dolor/sit'));
+Assert::same('/lorem/ipsum/dolor/sit', $h->absolutizePath('lorem/ipsum/dolor/sit'));
 
-Assert::same('lorem/ipsum/dolor/sit', $h->absolutizePath('lorem/././ipsum/dolor/sit'));
-Assert::same('ipsum/dolor/sit', $h->absolutizePath('lorem/././dolor/../../ipsum/dolor/sit'));
-
-Assert::same('ipsum/dolor/sit', $h->absolutizePath('./../.././lorem/././dolor/../../ipsum/dolor/sit/../sit/amet/..'));
+Assert::same('/lorem/ipsum/dolor/sit', $h->absolutizePath('lorem/././ipsum/dolor/sit'));
+Assert::same('/ipsum/dolor/sit', $h->absolutizePath('lorem/././dolor/../../ipsum/dolor/sit'));
 
+Assert::same('/ipsum/dolor/sit', $h->absolutizePath('./../.././lorem/././dolor/../../ipsum/dolor/sit/../sit/amet/..'));
 
+Assert::same('ipsum/dolor/sit', $h->absolutizePath('lorem/././dolor/../../ipsum/dolor/sit', NULL));
diff --git a/tests/PathsHelper/data-absolutize-path.ini b/tests/PathsHelper/data-absolutize-path.ini
index 59967b8..9caf036 100644
--- a/tests/PathsHelper/data-absolutize-path.ini
+++ b/tests/PathsHelper/data-absolutize-path.ini
@@ -1,3 +1,3 @@
 [readme]
 path = path/to/my/../text/./file.txt
-result = path/to/text/file.txt
+result = /path/to/text/file.txt