Explain FIFO nature of message in own example

lib/koans/10_processes.ex

@@ -28,7 +28,7 @@ defmodule Processes do
     assert Process.alive?(pid) == ___
   end
 
-  koan "Processes can send and receive messages; it's like a mailbox!" do
+  koan "Processes can send and receive messages" do
     send self, "hola!"
 
     receive do
@@ -36,6 +36,14 @@ defmodule Processes do
     end
   end
 
+  koan "Received messages are queued, first in first out" do
+    send self, "hola!"
+    send self, "como se llama?"
+
+    assert_receive ___
+    assert_receive ___
+  end
+
   koan "A common pattern is to include the sender in the message, so that it can reply" do
     greeter = fn ->
       receive do

test/koans/processes_koans_test.exs

@@ -10,6 +10,7 @@ defmodule ProcessesTests do
       true,
       true,
       "hola!",
+      {:multiple, ["hola!", "como se llama?"]},
       :how_are_you?,
       {:multiple, ["O", "HAI"]},
       {:multiple, ["foo", "bar"]},