diff --git a/ChangeLog b/ChangeLog
index 7303a768f2..1afccafd67 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Aug 11 22:59:57 2015  Tanaka Akira  <akr@fsij.org>
+
+	* numeric.c (Init_Numeric): Fix document for Float::MIN and
+	  Float::EPSILON.
+
 Tue Aug 11 15:22:31 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (ALLOCV_N): check integer overflow, as well
diff --git a/numeric.c b/numeric.c
index c041cabe76..10ed43c870 100644
--- a/numeric.c
+++ b/numeric.c
@@ -4264,9 +4264,14 @@ Init_Numeric(void)
      */
     rb_define_const(rb_cFloat, "MAX_10_EXP", INT2FIX(DBL_MAX_10_EXP));
     /*
-     *	The smallest positive integer in a double-precision floating point.
+     *	The smallest positive normalized number in a double-precision floating point.
      *
      *	Usually defaults to 2.2250738585072014e-308.
+     *
+     *	If the platform supports denormalized numbers,
+     *	there are numbers between zero and Float::MIN.
+     *	0.0.next_float returns the smallest positive floating point number
+     *	including denormalized numbers.
      */
     rb_define_const(rb_cFloat, "MIN", DBL2NUM(DBL_MIN));
     /*
@@ -4277,7 +4282,7 @@ Init_Numeric(void)
     rb_define_const(rb_cFloat, "MAX", DBL2NUM(DBL_MAX));
     /*
      *	The difference between 1 and the smallest double-precision floating
-     *	point number.
+     *	point number greater than 1.
      *
      *	Usually defaults to 2.2204460492503131e-16.
      */