diff --git a/docs/quickstart.md b/docs/quickstart.md
index 6dd2f9b..70feb11 100644
--- a/docs/quickstart.md
+++ b/docs/quickstart.md
@@ -32,6 +32,7 @@
 - most market data will only be available if you have a ship present at the given waypoint
 - jump gates are typically restricted to other jump gates within the same faction
 - most actions will result in a reactor cooldown, which will prevent your ship from taking other actions until the cooldown has expired
+- markets have a limit on how many units can be bought or sold at a given time, which is the same as the market's trade volume
 
 # Factions and Reputation
 
diff --git a/models/ShipNavSpeed.json b/models/ShipNavSpeed.json
index 84e626c..0afac5d 100644
--- a/models/ShipNavSpeed.json
+++ b/models/ShipNavSpeed.json
@@ -1,10 +1,11 @@
 {
   "type": "string",
-  "description": "The ship's set speed when travelling between waypoints. Nav speed can wear down the ship's engines and lower crew morale but improves travel time.",
+  "description": "The ship's set speed when travelling between waypoints.",
   "enum": [
-    "CONSERVATIVE",
+    "DRIFT",
+    "STEALTH",
     "CRUISE",
-    "MAX"
+    "BURN"
   ],
   "default": "CRUISE"
 }
\ No newline at end of file
diff --git a/models/ShipyardTransaction.json b/models/ShipyardTransaction.json
index dc0fd3e..8e9461b 100644
--- a/models/ShipyardTransaction.json
+++ b/models/ShipyardTransaction.json
@@ -1,7 +1,7 @@
 {
   "type": "object",
   "properties": {
-    "symbol": {
+    "shipSymbol": {
       "type": "string",
       "description": "The symbol of the ship that was purchased."
     },