From 2ae65723883486f3865f47bfec1cc783b14bdea7 Mon Sep 17 00:00:00 2001
From: Atsushi Sakai <asakai.amsl+github@gmail.com>
Date: Sun, 18 Mar 2018 10:25:15 -0700
Subject: [PATCH] update README

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index e2e4d83c..53619638 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,10 @@ Ref:
 
 This is a 2D localization example with Histogram filter.
 
+The red cross is true position, black points are RFID positions.
+
+The blue grid shows a position probability of histogram filter.  
+
 In this simulation, x,y are unknown, yaw is known.
 
 The filter integrates speed input and range observations from RFID for localization.