diff --git a/code/enumerable/select-last-vs-reverse-detect.rb b/code/enumerable/select-last-vs-reverse-detect.rb
index f2d64b5..7b0b7e2 100644
--- a/code/enumerable/select-last-vs-reverse-detect.rb
+++ b/code/enumerable/select-last-vs-reverse-detect.rb
@@ -3,11 +3,25 @@
 ARRAY = [*1..100]
 
 def fast
+  # "It just happens to line up" case
   ARRAY.reverse.detect { |x| (x % 10).zero? }
+
+  # "Middle of the road" case
+  # ARRAY.reverse.detect { |x| ((x % 10) == 60) }
+
+  # "Worst Case" scenario
+  # ARRAY.reverse.detect { |x| x == 1 }
 end
 
 def slow
+  # "It just happens to line up" case
   ARRAY.select { |x| (x % 10).zero? }.last
+
+  # "Middle of the road" case
+  # ARRAY.select { |x| ((x % 10) == 60)  }.last
+
+  # "Worst Case" scenario
+  # ARRAY.select { |x| x == 1  }.last
 end
 
 Benchmark.ips do |x|
@@ -15,3 +29,4 @@ def slow
   x.report('Enumerable#select.last')    { slow }
   x.compare!
 end
+