diff --git a/htdocs/core/ajax/onlineSign.php b/htdocs/core/ajax/onlineSign.php
index 5f3cc281f90..333bd1335a7 100644
--- a/htdocs/core/ajax/onlineSign.php
+++ b/htdocs/core/ajax/onlineSign.php
@@ -58,7 +58,7 @@ $action = GETPOST('action', 'aZ09');
 
 $signature = GETPOST('signaturebase64');
 $ref = GETPOST('ref', 'aZ09');
-$mode = GETPOST('mode', 'aZ09');
+$mode = GETPOST('mode', 'aZ09');	// 'proposal', ...
 $SECUREKEY = GETPOST("securekey"); // Secure key
 
 $error = 0;