diff --git a/numeric.c b/numeric.c
index de30ab8497..b9e28a5354 100644
--- a/numeric.c
+++ b/numeric.c
@@ -5179,10 +5179,11 @@ int_truncate(int argc, VALUE* argv, VALUE num)
  *   puts 1.object_id == a.object_id   #=> true
  *
  * There can only ever be one instance of the integer +1+, for example. Ruby ensures this
- * by preventing instantiation and duplication.
+ * by preventing instantiation. If duplication is attempted, the same instance is returned.
  *
- *   Integer.new(1)   #=> NoMethodError: undefined method `new' for Integer:Class
- *   1.dup            #=> TypeError: can't dup Integer
+ *   Integer.new(1)                   #=> NoMethodError: undefined method `new' for Integer:Class
+ *   1.dup                            #=> 1
+ *   1.object_id == 1.dup.object_id   #=> true
  *
  * For this reason, Numeric should be used when defining other numeric classes.
  *
diff --git a/version.h b/version.h
index ceeed666d9..2bd9ff02f0 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.5"
 #define RUBY_RELEASE_DATE "2018-07-30"
-#define RUBY_PATCHLEVEL 307
+#define RUBY_PATCHLEVEL 308
 
 #define RUBY_RELEASE_YEAR 2018
 #define RUBY_RELEASE_MONTH 7