improved readme

README.md

@@ -469,6 +469,20 @@ heap, all it does is sets the bond as a proxy to the off heap memory, this proxy
 `DataValueClasses.newDirectReference(BondVOInterface.class)`, it allows us access to the fields of our
 entry, directly into the off heap storage.
 
+
+as above, ideally you would reuse the `using` variable.
+
+ ``` java
+BondVOInterface using = DataValueClasses.newDirectReference(BondVOInterface.class);
+
+for(int i=1;i<=10;i++) {
+  Value bond = map.getUsing(key,using); // this won’t create a new value each time.
+  assert using == bond; // this will always be the same instance
+}
+```
+
+
+
 so when you call :
 
 ``` java