diff --git a/lib/ex_unit/lib/ex_unit.ex b/lib/ex_unit/lib/ex_unit.ex
index fd90f6d95f8..a4504d1e4b6 100644
--- a/lib/ex_unit/lib/ex_unit.ex
+++ b/lib/ex_unit/lib/ex_unit.ex
@@ -11,11 +11,11 @@ defmodule ExUnit do
       # 1) Start ExUnit.
       ExUnit.start()
 
-      # 2) Create a new test module (test case) and use "ExUnit.Case".
+      # 2) Create a new test module and use "ExUnit.Case".
       defmodule AssertionTest do
-        # 3) Note that we pass "async: true", this runs the test case
-        #    concurrently with other test cases. The individual tests
-        #    within each test case are still run serially.
+        # 3) Note that we pass "async: true", this runs the tests in the
+        #    test module concurrently with other test modules. The 
+        #    individual tests within each test module are still run serially.
         use ExUnit.Case, async: true
 
         # 4) Use the "test" macro instead of "def" for clarity.