diff --git a/README.txt b/README.txt
index f25716e32ebe3982375159e4b78f7dc6eb69a315..a55f5794d9d3c154653c281fc15ee7b9110f6b9c 100644
--- a/README.txt
+++ b/README.txt
@@ -39,6 +39,7 @@ Requirements
   http://drupal.org/node/599136
   http://drupal.org/node/531522
 - Drupal 6.14 or higher.
+- PHP 5.2.x
 
 Installation
 ============