diff --git a/dydx3/constants.py b/dydx3/constants.py
index d90306e..c0672fd 100644
--- a/dydx3/constants.py
+++ b/dydx3/constants.py
@@ -22,8 +22,10 @@
 ORDER_TYPE_LIMIT = 'LIMIT'
 ORDER_TYPE_MARKET = 'MARKET'
 ORDER_TYPE_STOP = 'STOP_LIMIT'
+ORDER_TYPE_STOP_MARKET = 'STOP_MARKET'
 ORDER_TYPE_TRAILING_STOP = 'TRAILING_STOP'
 ORDER_TYPE_TAKE_PROFIT = 'TAKE_PROFIT'
+ORDER_TYPE_TAKE_PROFIT_MARKET = 'TAKE_PROFIT_MARKET'
 
 # ------------ Order Side ------------
 ORDER_SIDE_BUY = 'BUY'
diff --git a/dydx3/modules/private.py b/dydx3/modules/private.py
index e14092e..7433b18 100644
--- a/dydx3/modules/private.py
+++ b/dydx3/modules/private.py
@@ -459,6 +459,7 @@ def create_order(
         expiration=None,
         expiration_epoch_seconds=None,
         signature=None,
+        reduce_only=False,
     ):
         '''
         Post an order
@@ -486,11 +487,16 @@ def create_order(
             "STOP",
             "TRAILING_STOP",
             "TAKE_PROFIT",
+            "STOP_MARKET",
+            "TAKE_PROFIT_MARKET",
         ]
 
         :param post_only: required
         :type post_only: bool
 
+        :param reduce_only: optional
+        :type reduce_only: bool
+
         :param size: required
         :type size: str
 
@@ -578,6 +584,7 @@ def create_order(
             'triggerPrice': trigger_price,
             'trailingPercent': trailing_percent,
             'postOnly': post_only,
+            'reduceOnly': reduce_only,
             'clientId': client_id,
             'signature': order_signature,
         }