diff --git a/Rakefile b/Rakefile
index 1c06f072..f2b04ca5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -114,17 +114,26 @@ namespace :benchmark do
     puts "Changes between #{reference}...#{compare}"
     changes = reference_classifications.deep_diff(compare_classifications)
 
+    # Are there any differences in the linguist classification?
     if changes.any?
       changes.each do |lang, files|
         previous_count = reference_classifications[lang].size
+
+        # Count the number of changed classifications (language and number)
         summary = changes[lang].inject(Hash.new(0)) do |result, (key, val)|
           new_lang = val.last
           result[new_lang] += 1
           result
         end
-      end
 
-      puts summary
+        puts "#{lang}"
+
+        # Work out the percentage change
+        summary.each do |new_lang, count|
+          percent = count / previous_count.to_f
+          puts "  #{sprintf("%.2f", percent)}% change to #{new_lang} (count files)"
+        end
+      end
     else
       puts "No changes"
     end