diff --git a/ChangeLog b/ChangeLog
index cf8ac26fda..46dd38ba57 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Feb 22 15:13:38 2014  Benoit Daloze  <eregontp@gmail.com>
+
+	* range.c (Range#size): [DOC] improve description and add examples.
+	  Patch by @skade. [Fixes GH-501]
+
 Sat Feb 22 15:07:58 2014  Zachary Scott  <e@zzak.io>
 
 	* lib/racc/rdoc/grammar.en.rdoc: [DOC] Correct grammar and typos
diff --git a/range.c b/range.c
index 4526dcba89..d2d9a707c0 100644
--- a/range.c
+++ b/range.c
@@ -711,9 +711,12 @@ sym_each_i(RB_BLOCK_CALL_FUNC_ARGLIST(v, arg))
  *  call-seq:
  *     rng.size                   -> num
  *
- *  Returns the number of elements in the range.
+ *  Returns the number of elements in the range. Both the begin and the end of
+ *  the Range must be Numeric, otherwise nil is returned.
  *
  *    (10..20).size    #=> 11
+ *    ('a'..'z').size  #=> nil
+ *    (-Float::INFINITY..Float::INFINITY).size #=> Infinity
  */
 
 static VALUE
diff --git a/version.h b/version.h
index e6f197f5b0..5af029549a 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.1.1"
 #define RUBY_RELEASE_DATE "2014-02-22"
-#define RUBY_PATCHLEVEL 62
+#define RUBY_PATCHLEVEL 63
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 2