diff --git a/README.md b/README.md
index 677a7a9..331303e 100644
--- a/README.md
+++ b/README.md
@@ -1346,24 +1346,26 @@ Comparison:
 
 ```
 $ ruby -v code/range/cover-vs-include.rb
-ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
-
+ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
+Warming up --------------------------------------
+        range#cover?   164.598k i/100ms
+      range#include?     9.327k i/100ms
+       range#member?     9.366k i/100ms
+       plain compare   198.178k i/100ms
+            between?   211.880k i/100ms
 Calculating -------------------------------------
-        range#cover?    85.467k i/100ms
-      range#include?     7.720k i/100ms
-       range#member?     7.783k i/100ms
-       plain compare   102.189k i/100ms
--------------------------------------------------
-        range#cover?      1.816M (± 5.6%) i/s -      9.060M
-      range#include?     83.344k (± 5.0%) i/s -    416.880k
-       range#member?     82.654k (± 5.0%) i/s -    412.499k
-       plain compare      2.581M (± 6.2%) i/s -     12.876M
+        range#cover?      2.681M (± 4.5%) i/s -     13.497M in   5.044550s
+      range#include?     94.109k (± 1.2%) i/s -    475.677k in   5.055317s
+       range#member?     94.958k (± 1.8%) i/s -    477.666k in   5.031849s
+       plain compare      3.857M (± 1.1%) i/s -     19.421M in   5.035455s
+            between?      4.694M (± 1.5%) i/s -     23.519M in   5.011280s
 
 Comparison:
-       plain compare:  2581211.8 i/s
-        range#cover?:  1816038.5 i/s - 1.42x slower
-      range#include?:    83343.9 i/s - 30.97x slower
-       range#member?:    82654.1 i/s - 31.23x slower
+            between?:  4694228.0 i/s
+       plain compare:  3857415.9 i/s - 1.22x  slower
+        range#cover?:  2681447.3 i/s - 1.75x  slower
+       range#member?:    94958.2 i/s - 49.43x  slower
+      range#include?:    94109.3 i/s - 49.88x  slower
 ```
 
 
diff --git a/code/range/cover-vs-include.rb b/code/range/cover-vs-include.rb
index c044269..c5c32c4 100644
--- a/code/range/cover-vs-include.rb
+++ b/code/range/cover-vs-include.rb
@@ -10,6 +10,7 @@
   x.report('range#include?') { (BEGIN_OF_JULY..END_OF_JULY).include? DAY_IN_JULY }
   x.report('range#member?') { (BEGIN_OF_JULY..END_OF_JULY).member? DAY_IN_JULY }
   x.report('plain compare') { BEGIN_OF_JULY < DAY_IN_JULY && DAY_IN_JULY < END_OF_JULY }
-
+  x.report('between?') { DAY_IN_JULY.between?(BEGIN_OF_JULY,END_OF_JULY) }
+  
   x.compare!
 end