diff --git a/lib/src/main/java/nl/sanderhautvast/json/ser/Mapper.java b/lib/src/main/java/nl/sanderhautvast/json/ser/Mapper.java
index 51dfead..06fbc6a 100644
--- a/lib/src/main/java/nl/sanderhautvast/json/ser/Mapper.java
+++ b/lib/src/main/java/nl/sanderhautvast/json/ser/Mapper.java
@@ -9,6 +9,10 @@ import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 
 
+/**
+ * Mapper.json(StringBuilder b, ...)
+ * TODO write to outputstream
+ */
 public class Mapper {
     private static final Map<Class<?>, BaseMapper<?>> mappers = new ConcurrentHashMap<>();