diff --git a/README b/README
index 6750fb09d7969a3670ad103b157a1371e5f7ac4f..8cfb2efcc41b927520f800da1bc6b70236cbd66e 100644
--- a/README
+++ b/README
@@ -1,10 +1,12 @@
 * COMMENT -*- mode: org -*-
 #+Date: 2015-09-07
-Time-stamp: <2015-09-07>
+Time-stamp: <2015-09-08>
 
 * 2015-09-07 write an apache2 access log parser in haskell.
 practice using attoparsec.
 
+LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %D" keystone
+
 10.21.176.7 - - [06/Sep/2015:06:26:02 +0800] "GET /v3/auth/tokens HTTP/1.1" 200 3997 "-" "-" 1011068
 10.21.176.7 - - [06/Sep/2015:06:26:03 +0800] "GET /v3/auth/tokens HTTP/1.1" 200 4065 "-" "python-requests/2.2.1 CPython/2.7.3 Linux/3.13.0-38-generic" 5481
 10.21.176.7 - - [06/Sep/2015:06:26:02 +0800] "GET /v2.0/tokens/e79ce79f16f04852a7d981009090fb75 HTTP/1.1" 200 2692 "-" "python-requests/2.2.1 CPython/2.7.3 Linux/3.13.0-40-generic" 879293