diff --git a/CHANGELOG.md b/CHANGELOG.md
index 717d6571..15474c01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ This is the changelog between releases of PHPWord. Releases are listed in revers
 Place announcement text here.
 
 ### Changes
+- Improved error message for the case when ``autoload.php`` is not found. - @RomanSyroeshko #371
 - Changed visibility of all private properties and methods of ``TemplateProcessor`` to ``protected``. - RomanSyroeshko #498
 - Improved performance of ``TemplateProcessor::setValue()``. - @RomanSyroeshko #513
 - Renamed ``align`` option of ``Paragraph`` style into ``alignment``. Note: accessor and mutator methods are renamed too. - @RomanSyroeshko
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 4932a21b..6a1398a4 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -22,11 +22,16 @@ if (!defined('PHPWORD_TESTS_BASE_DIR')) {
     define('PHPWORD_TESTS_BASE_DIR', realpath(__DIR__));
 }
 
-$vendor = realpath(__DIR__ . '/../vendor');
-if (file_exists($vendor . '/autoload.php')) {
-    require $vendor . '/autoload.php';
+$vendorDirPath = realpath(__DIR__ . '/../vendor');
+if (file_exists($vendorDirPath . '/autoload.php')) {
+    require $vendorDirPath . '/autoload.php';
 } else {
-    throw new Exception('Unable to load dependencies');
+    throw new Exception(
+        sprintf(
+            'Could not find file \'%s\'. It is generated by Composer. Use \'install\' or \'update\' Composer commands to move forward.',
+            $vendorDirPath . '/autoload.php'
+        )
+    );
 }
 
 spl_autoload_register(function ($class) {