diff --git a/_testing/README b/_testing/README
index 9ec2e313758148c53c110658678190c161f86c8b..0987cb605411dedc4dd563bfd10d0e7cbd82f4e4 100644
--- a/_testing/README
+++ b/_testing/README
@@ -9,6 +9,7 @@
 Installation:
 The easiest way to install phpunit is via pear:
   pear config-set auto_discover 1
+  pear upgrade
   pear install pear.phpunit.de/PHPUnit
 
 ==== Run unit tests ====