diff --git a/INSTALL.md b/INSTALL.md
index f35d68b..24749d3 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -26,7 +26,7 @@ install and configure PrivateBin on your server. It's available on
     - `open_basedir` access to `/dev/urandom`
     - mcrypt extension AND `open_basedir` access to `/dev/urandom`
     - com_dotnet extension
-- GD extension
+- GD extension (when using identicon or vizhash icons, jdenticon works without it)
 - zlib extension
 - some disk space or a database supported by [PDO](https://php.net/manual/book.pdo.php)
 - ability to create files and folders in the installation directory and the PATH
diff --git a/tst/IconTest b/tst/IconTest
index 75dbb27..57145e1 100755
--- a/tst/IconTest
+++ b/tst/IconTest
@@ -28,7 +28,8 @@ $jdenticon = new Jdenticon(array(
     ),
 ));
 $jdenticonGenerators = array(
-    'jdenticon PNG' => 'png',
+    'jdenticon' => 'png',
+    'jdenticon ImageMagick' => 'png',
     'jdenticon SVG' => 'svg',
 );
 $results = array(
@@ -48,7 +49,11 @@ $results = array(
         'lengths' => array(),
         'time' => 0
     ),
-    'jdenticon PNG' => array(
+    'jdenticon' => array(
+        'lengths' => array(),
+        'time' => 0
+    ),
+    'jdenticon ImageMagick' => array(
         'lengths' => array(),
         'time' => 0
     ),
@@ -89,6 +94,11 @@ foreach ($identiconGenerators as $key => $identicon) {
 
 foreach ($jdenticonGenerators as $key => $format) {
     echo 'run ', $key,' tests', PHP_EOL;
+    if ($key === 'jdenticon ImageMagick') {
+        $jdenticon->enableImageMagick = true;
+    } else {
+        $jdenticon->enableImageMagick = false;
+    }
     $start = microtime(true);
     foreach ($hmacs as $i => $hmac) {
         $jdenticon->setHash($hmac);