diff --git a/koans/about_constants.rb b/koans/about_constants.rb
index 0beccdc..006f1c0 100644
--- a/koans/about_constants.rb
+++ b/koans/about_constants.rb
@@ -67,7 +67,7 @@ class AboutConstants < EdgeCase::Koan
   end
 
   # QUESTION: Which has precedence: The constant in the lexical scope,
-  # or the constant from the inheritance heirarachy?
+  # or the constant from the inheritance hierarchy?
 
   # ------------------------------------------------------------------