diff --git a/include/ArduinoJson/Internals/StringBuilder.hpp b/include/ArduinoJson/Internals/StringBuilder.hpp
index ed720595..0243239b 100644
--- a/include/ArduinoJson/Internals/StringBuilder.hpp
+++ b/include/ArduinoJson/Internals/StringBuilder.hpp
@@ -10,6 +10,8 @@
 
 namespace ArduinoJson {
 namespace Internals {
+
+// A Print implementation that allows to write in a char[]
 class StringBuilder : public Print {
  public:
   StringBuilder(char *buf, int size)
diff --git a/include/ArduinoJson/JsonArray.hpp b/include/ArduinoJson/JsonArray.hpp
index f5d24fa4..7765d9c5 100644
--- a/include/ArduinoJson/JsonArray.hpp
+++ b/include/ArduinoJson/JsonArray.hpp
@@ -11,45 +11,75 @@
 #include "Internals/ReferenceType.hpp"
 #include "JsonVariant.hpp"
 
+// Returns the size (in bytes) of an array with n elements.
+// Can be very handy to determine the size of a StaticJsonBuffer.
 #define JSON_ARRAY_SIZE(NUMBER_OF_ELEMENTS) \
   (sizeof(JsonArray) + (NUMBER_OF_ELEMENTS) * sizeof(JsonArray::node_type))
 
 namespace ArduinoJson {
 
+// Forward declaration
 class JsonObject;
 class JsonBuffer;
 
+// An array of JsonVariant.
+// Can be converted to a JSON string via JsonArray::printTo().
+// Can be extracted from a JSON string JsonBuffer::parseArray().
 class JsonArray : public Internals::JsonPrintable<JsonArray>,
                   public Internals::ReferenceType,
                   public Internals::List<JsonVariant> {
+  // JsonBuffer is a friend because it needs to call the private constructor of
+  // JsonArray from createArray() and parseArray().
   friend class JsonBuffer;
 
  public:
+  // Returns the JsonVariant at the specified index (synonym for at())
   value_type &operator[](int index) const { return at(index); }
+
+  // Returns the JsonVariant at the specified index (synonym for operator[])
   value_type &at(int index) const;
 
+  // Adds an uninitialized JsonVariant at the end of the array.
+  value_type &add();
+
+  // Adds the specified value at the end of the array.
   template <typename T>
   void add(T value) {
     add().set(value);
   }
 
-  value_type &add();
+  // Adds the specified double value at the end of the array.
+  // The value will be printed with the specified number of decimal digits.
   void add(double value, uint8_t decimals) { add().set(value, decimals); }
-  void add(JsonArray &nestedArray) { add().set(nestedArray); }
-  void add(JsonObject &nestedObject) { add().set(nestedObject); }
 
+  // Adds a reference to the specified JsonArray at the end of the array.
+  void add(JsonArray &array) { add().set(array); }
+
+  // Adds a reference to the specified JsonObject at the end of the array.
+  void add(JsonObject &obejct) { add().set(obejct); }
+
+  // Creates a JsonArray and adds a reference at the end of the array.
+  // It's a shortcut for JsonBuffer::createArray() and JsonArray::add()
   JsonArray &createNestedArray();
+
+  // Creates a JsonObject and adds a reference at the end of the array.
+  // It's a shortcut for JsonBuffer::createObject() and JsonArray::add()
   JsonObject &createNestedObject();
 
+  // Returns a reference an invalid JsonArray.
+  // This is used when memory allocation or JSON parsing fail.
   static JsonArray &invalid() { return _invalid; }
 
+  // Writes the array to a JsonWriter.
   template <typename T>
   void writeTo(T &writer) const;
 
  private:
-  // constructor is private: instance must be created via a JsonBuffer
+  // Create an empty JsonArray attached to the specified JsonBuffer.
+  // Constructor is private: instance must be created via a JsonBuffer
   explicit JsonArray(JsonBuffer *buffer) : List(buffer) {}
 
+  // The instance returned by JsonArray::invalid()
   static JsonArray _invalid;
 };
 }