diff --git a/MtApi/TradeOperation.cs b/MtApi/TradeOperation.cs
index 981b7233..105e8c1c 100755
--- a/MtApi/TradeOperation.cs
+++ b/MtApi/TradeOperation.cs
@@ -7,6 +7,9 @@
         OP_BUYLIMIT     = 2,
         OP_SELLLIMIT    = 3,
         OP_BUYSTOP      = 4,
-        OP_SELLSTOP     = 5
+        OP_SELLSTOP     = 5,
+        OP_BALANCE      = 6,
+        OP_CREDIT       = 7,
+        OP_REBATE       = 8
     }
 }