diff --git a/qfq/store/Sip.php b/qfq/store/Sip.php
index 284fcab88ffb2492c02fb8180885f98e42cbdcc3..21decae1b81bffb3a3cbafe58a1e88db5eb7ca06 100644
--- a/qfq/store/Sip.php
+++ b/qfq/store/Sip.php
@@ -224,7 +224,7 @@ class Sip {
 
         # Check if index 's' exists.
         if (!isset($_SESSION[$s])) {
-            throw new UserException("SIP '$s' not registered - please reload the previous site.", ERROR_SIP_NOT_FOUND);
+            throw new UserException("SIP '$s' not registered - please reload the previous site and try again.", ERROR_SIP_NOT_FOUND);
         }
 
         // Decode parameter