diff --git a/src/main/java/org/json/JSONObject.java b/src/main/java/org/json/JSONObject.java
index 4c08b0b9c..7a73fbf22 100644
--- a/src/main/java/org/json/JSONObject.java
+++ b/src/main/java/org/json/JSONObject.java
@@ -2701,6 +2701,7 @@ static final Writer writeValue(Writer writer, Object value,
         if (value == null || value.equals(null)) {
             writer.write("null");
         } else if (value instanceof JSONString) {
+            // JSONString must be checked first, so it can overwrite behaviour of other types below
             Object o;
             try {
                 o = ((JSONString) value).toJSONString();