more README changes

README.md

@@ -119,7 +119,9 @@ fn main() {
 ```
 
 Notice how the code is calling the 'open()', 'high()', 'low()' and 'close()' 
-methods on the 'MyCandle' struct. These are automatically generated getters that have the same name as the field.
+methods on the 'MyCandle' struct. 
+These are getters automatically generated by the [Candle](trade_aggregation_derive/src/lib.rs) macro, 
+that have the same name as the field.
 
 See examples folder for more.
 Run examples using