akr	2011-11-08 06:01:40 +0900 (Tue, 08 Nov 2011)

  New Revision: 33664

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=33664

  Log:
    update doc.

  Modified files:
    trunk/io.c

Index: io.c
===================================================================
--- io.c	(revision 33663)
+++ io.c	(revision 33664)
@@ -2357,7 +2357,10 @@
  *     }
  *
  *  Note that this method behaves like fread() function in C.
- *  If you need the behavior like read(2) system call,
+ *  This means it retry to invoke read(2) system call to read data with the specified length (or until EOF).
+ *  This behavior is preserved even if <i>ios</i> is non-blocking mode.
+ *  (This method is non-blocking flag insensitive as other methods.)
+ *  If you need the behavior like single read(2) system call,
  *  consider readpartial, read_nonblock and sysread.
  */
 

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