diff --git a/README.md b/README.md
index f249bb0..0d5f440 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Client
   * activated JavaScript
 
 Server
-  * >= PHP 5.4
+  * >= PHP 5.5 (only if using auth; if not PHP 5.4 works either)
   * optional: cURL extention (for remote upload)
 
 ## issues