diff --git a/koans/about_true_and_false.rb b/koans/about_true_and_false.rb
index d585644..1138fb9 100644
--- a/koans/about_true_and_false.rb
+++ b/koans/about_true_and_false.rb
@@ -10,7 +10,7 @@ class AboutTrueAndFalse < EdgeCase::Koan
   end
 
   def test_true_is_treated_as_true
-    assert_equal __, truth_value(true)    
+    assert_equal __, truth_value(true)
   end
 
   def test_false_is_treated_as_false