diff --git a/API-Reference.md b/API-Reference.md
index 675ee9e..b798b80 100644
--- a/API-Reference.md
+++ b/API-Reference.md
@@ -121,7 +121,7 @@ unsigned short  get<unsigned short> (size_t index) const;
 
 ##### Arguments
 
-`index`: the index of the the value in the array.
+`index`: the index of the value in the array.
 
 `T`: the type of the value
 
@@ -669,6 +669,108 @@ JsonObject& object2 = jsonBuffer.parseObject(json);
 ```
 
 
+### JsonObject::createNestedArray()
+
+##### Description
+Creates a `JsonArray` as a child of the current object.
+
+##### Signature
+
+```c++
+JsonArray& createNestedArray(const char* key) const;
+JsonArray& createNestedArray(const String& key) const; // <- duplicates key
+```
+
+##### Arguments
+
+`key`: the key of the array in the object, can be a `const char*` or a `const String&`
+
+##### Remarks
+
+When you add a value using a `String` for key, a copy of the string is made, causing the `JsonBuffer` to grow.
+The memory allocated for the copy will only be freed when the whole `JsonBuffer` is discarded.
+To avoid this behavior, use a `const char*` key instead.
+
+##### Return value
+
+A reference to the new `JsonArray`
+
+##### Example
+
+```c++
+StaticJsonBuffer<256> jsonBuffer;
+JsonObject& root = jsonBuffer.createObject();
+root["status"] = "on";
+JsonArray& levels = root.createNestedArray("levels");
+levels.add(10);
+levels.add(30);
+root.prettyPrintTo(Serial);
+```
+
+will print
+
+```json
+{
+  "status": "on",
+  "levels": [
+  	10,
+  	20
+  ]
+}
+```
+
+
+### JsonObject::createNestedObject()
+
+##### Description
+Creates a `JsonObject` as a child of the current object.
+
+##### Signature
+
+```c++
+JsonObject& createNestedObject(const char* key) const;
+JsonObject& createNestedObject(const String& key) const; // <- duplicates key
+```
+
+##### Arguments
+
+`key`: the key of the object in the object, can be a `const char*` or a `const String&`
+
+##### Remarks
+
+When you add a value using a `String` for key, a copy of the string is made, causing the `JsonBuffer` to grow.
+The memory allocated for the copy will only be freed when the whole `JsonBuffer` is discarded.
+To avoid this behavior, use a `const char*` key instead.
+
+##### Return value
+
+A reference to the new `JsonObject`
+
+##### Example
+
+```c++
+StaticJsonBuffer<256> jsonBuffer;
+JsonObject& root = jsonBuffer.createObject();
+root["city"] = "Paris";
+JsonObject& weather = root.createNestedObject("weather");
+weather["temp"] = 14.2;
+weather["cond"] = "cloudy";
+root.prettyPrintTo(Serial);
+```
+
+will print
+
+```json
+{
+  "city": "Paris",
+  "weather": {
+  	"temp": 14.20,
+  	"cond": "cloudy"
+  }
+}
+```
+
+
 ### JsonObject::get()
 
 ##### Description
@@ -697,7 +799,7 @@ unsigned short  get<unsigned short> (JsonObjectKey key) const;
 
 ##### Arguments
 
-`key`: the key of the the value in the object, can be a `const char*` or a `const String&`
+`key`: the key of the value in the object, can be a `const char*` or a `const String&`
 
 `T`: the type of the value