diff --git a/ChangeLog b/ChangeLog
index 6c529c0e43..2a80eb5cf2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -28,6 +28,12 @@ Thu Apr  3 09:00:45 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* tool/instruction.rb (OptUnifsIncGenerator): ditto.
 
+Thu Apr  3 08:46:09 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* range.c (range_include): add RDoc to describe that comparison
+	  for numeric is done according magnitude of values.
+	  [ruby-core:15907]
+
 Wed Apr  2 22:29:35 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* rational.c (nurat_int_check): function for DRY integer check.
diff --git a/range.c b/range.c
index 94e8182a87..be6b3e52bb 100644
--- a/range.c
+++ b/range.c
@@ -720,7 +720,8 @@ range_eqq(VALUE range, VALUE val)
  *     rng.include?(val) =>  true or false
  *  
  *  Returns <code>true</code> if <i>obj</i> is an element of
- *  <i>rng</i>, <code>false</code> otherwise.
+ *  <i>rng</i>, <code>false</code> otherwise.  If beg and end are
+ *  numeric, comparison is done according magnitude of values.
  *     
  *     ("a".."z").include?("g")  # => true
  *     ("a".."z").include?("A")  # => false