diff --git a/lib/mutant/matcher/namespace.rb b/lib/mutant/matcher/namespace.rb
index 05914797..73f229e2 100644
--- a/lib/mutant/matcher/namespace.rb
+++ b/lib/mutant/matcher/namespace.rb
@@ -29,7 +29,7 @@ module Mutant
 
     private
 
-      # Test scope if name matches expresion
+      # Test scope if name matches expression
       #
       # @param [Module, Class] scope
       #