diff --git a/Guardfile b/Guardfile
index 6740bc01..b0ce4ed9 100644
--- a/Guardfile
+++ b/Guardfile
@@ -4,7 +4,7 @@ guard :bundler do
   watch('Gemfile')
 end
 
-guard :rspec, :cli => '--fail-fast --backtrace', :all_on_start => false, :all_after_pass => false do
+guard :rspec, :cli => '--fail-fast', :all_on_start => false, :all_after_pass => false do
   # run all specs if the spec_helper or supporting files files are modified
   watch('spec/spec_helper.rb')                      { 'spec/unit' }
   watch(%r{\Aspec/(?:lib|support|shared)/.+\.rb\z}) { 'spec/unit' }
diff --git a/TODO b/TODO
index b15df81c..16c96065 100644
--- a/TODO
+++ b/TODO
@@ -3,6 +3,7 @@ Code:
   * Fix ugly code within default parameter mutations
   * Break up lib/mutant/mutator/node/send.rb in class specific files
   * Log all warnings through reporter, so remove random $stderr.puts calls
+  * Use rational to represent percent values
 
 AST:
   * Use whitequarcks parser and the to be writte unparser. This fixes all RBX AST issues.