diff --git a/include/ki/dml/Field.h b/include/ki/dml/Field.h
index 31e15c9..901c42b 100644
--- a/include/ki/dml/Field.h
+++ b/include/ki/dml/Field.h
@@ -36,6 +36,10 @@ namespace dml
 	private:
 		ValueT m_value;
 
+		/**
+		* Returns a new Field with the same name, transferability,
+		* type, and value but with a different owner Record.
+		*/
 		Field<ValueT> *clone(const Record &record) const final
 		{
 			auto *clone = new Field<ValueT>(m_name, record);
diff --git a/include/ki/dml/FieldBase.h b/include/ki/dml/FieldBase.h
index 6969742..a9e789f 100644
--- a/include/ki/dml/FieldBase.h
+++ b/include/ki/dml/FieldBase.h
@@ -11,6 +11,9 @@ namespace dml
 {
 	class Record;
 
+	/**
+	 * An abstract base class for DML fields.
+	 */
 	class FieldBase : public util::Serializable
 	{
 		friend Record;
@@ -33,6 +36,10 @@ namespace dml
 
 		FieldBase(std::string name, const Record& record);
 
+		/**
+		 * Returns a new Field with the same name, transferability
+		 * and value but with a different owner Record.
+		 */
 		virtual FieldBase *clone(const Record &record) const = 0;
 	private:
 		const Record &m_record;
diff --git a/include/ki/dml/Record.h b/include/ki/dml/Record.h
index d3dd046..f48695d 100644
--- a/include/ki/dml/Record.h
+++ b/include/ki/dml/Record.h
@@ -6,6 +6,9 @@ namespace ki
 {
 namespace dml
 {
+	/**
+	 * An ordered collection of DML fields.
+	 */
 	class Record final : public util::Serializable
 	{
 	public:
@@ -13,8 +16,16 @@ namespace dml
 		Record(const Record &record);
 		virtual ~Record();
 
+		/**
+		 * Returns true if a field of any type has the name
+		 * specified.
+		 */
 		bool has_field(std::string name) const;
 
+		/**
+		 * Returns true if a field exists with the specified
+		 * name and type.
+		 */
 		template <typename ValueT>
 		bool has_field(std::string name) const
 		{
@@ -23,6 +34,13 @@ namespace dml
 			return m_field_map.at(name)->is_type<ValueT>();
 		}
 
+		/**
+		 * Returns a previously added field with the specified name
+		 * and type.
+		 * 
+		 * If the field was not previously added, then a nullptr is
+		 * returned.
+		 */
 		template <typename ValueT>
 		Field<ValueT> *get_field(std::string name) const
 		{
@@ -31,6 +49,16 @@ namespace dml
 			return nullptr;
 		}
 
+		/**
+		 * Adds a new field to the record with the specified name, type,
+		 * and transferability, and returns the newly created field.
+		 * 
+		 * If a field already exists with the specified name and type,
+		 * then the previously added field is returned.
+		 * 
+		 * If a field already exists with the specified name, but the type
+		 * differs, then a nullptr is returned.
+		 */
 		template <typename ValueT>
 		Field<ValueT> *add_field(std::string name, bool transferable = true)
 		{