diff --git a/README.md b/README.md
index efb1d3e..ab12c40 100644
--- a/README.md
+++ b/README.md
@@ -321,10 +321,9 @@ const valid = (address.hashPart == hash);
 
 Parameters:
 
-* `source` (string, optional): sender address. for cases than source of transaction is important for dapp. wallet should check it or select from few accounts if wallet controls mora than one.
+* `source` (string, optional): sender address. Provided in case the source of transaction is important to the dapp. Wallet application must select the appropriate wallet contract to send the message from, or post an error if it does not have the keys to that specific address.
 * `valid_until` (integer, optional): unix timestamp. after th moment transaction will be invalid.
-* `messages` (array of messages): 1-4 outgoing messages from wallet to over accounts
-* `messages_ordering` (enum string <sync|async>, optinal, default - sync): how messages should be sent if `messages` contains more than one message. in one transaction with one signature or few transactions with different signatures and after executing the previous one.
+* `messages` (array of messages): 1-4 outgoing messages from the wallet contract to other accounts. All messages are sent out in order, however **the wallet cannot guarantee that messages will be delivered and executed in same order**.
 
 Message structure:
 * `address` (string): message destination
@@ -346,7 +345,6 @@ Example:
 {
   "source": "0:E8FA2634A24AEF18ECB5FD4FC71A21B9E95F05768F8D9733C44ED598DB106C4C",
   "valid_until": 1658253458,
-  "messages_ordering": "async",
   "messages": [
     {
       "address": "0:412410771DA82CBA306A55FA9E0D43C9D245E38133CB58F1457DFB8D5CD8892F",