1 files changed, 9 insertions, 0 deletions
diff --git a/src/main/scala/cc/spray/json/AdditionalFormats.scala b/src/main/scala/cc/spray/json/AdditionalFormats.scala
index e8b59c7..db9d3ba 100644
--- a/src/main/scala/cc/spray/json/AdditionalFormats.scala
+++ b/src/main/scala/cc/spray/json/AdditionalFormats.scala
@@ -27,17 +27,26 @@ trait AdditionalFormats {
     def read(value: JsValue) = value
   }
 
+  /**
+   * Constructs a JsonFormat from its two parts, JsonReader and JsonWriter.
+   */
   def jsonFormat[T](reader: JsonReader[T], writer: JsonWriter[T]) = new JsonFormat[T] {
     def write(obj: T) = writer.write(obj)
     def read(json: JsValue) = reader.read(json)
   }
 
+  /**
+   * Turns a JsonWriter into a JsonFormat that throws an UnsupportedOperationException for reads.
+   */
   def lift[T](writer :JsonWriter[T]) = new JsonFormat[T] {
     def write(obj: T): JsValue = writer.write(obj)
     def read(value: JsValue) =
       throw new UnsupportedOperationException("JsonReader implementation missing")
   }
 
+  /**
+   * Turns a JsonReader into a JsonFormat that throws an UnsupportedOperationException for writes.
+   */
   def lift[T <: AnyRef](reader :JsonReader[T]) = new JsonFormat[T] {
     def write(obj: T): JsValue =
       throw new UnsupportedOperationException("No JsonWriter[" + obj.getClass + "] available")