diff --git a/config/flay.yml b/config/flay.yml
index 9ebcfc26..05e65551 100644
--- a/config/flay.yml
+++ b/config/flay.yml
@@ -1,3 +1,3 @@
 ---
 threshold: 15
-total_score: 155
+total_score: 161
diff --git a/lib/mutant.rb b/lib/mutant.rb
index df61d78b..8f947e1a 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -28,6 +28,8 @@ module Mutant
   # @return [false]
   #   returns false otherwise
   #
+  # @api private
+  #
   def self.on_18?
     RUBY_VERSION == '1.8.7'
   end