From 16bf03793bd28d61e6dac97379ac7df1a7afce55 Mon Sep 17 00:00:00 2001
From: Charles Baylis <charles.baylis@linaro.org>
Date: Fri, 15 Dec 2017 16:39:52 +0000
Subject: Update README.

Change-Id: Ica673264bc1573f85933da9299430ef85b4f1f81
---
 README | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README b/README
index 6846822..3ac7232 100644
--- a/README
+++ b/README
@@ -33,4 +33,15 @@ Command line interface
     --perf <path>                                      [default: perf]
        * name of perf binary to use for analysing perf.data file
 
+Interpreting output
+===================
 
+Each column shows the activity on a particular CPU. Each row represents
+the behaviour of the system for a slice of time while the profile data
+was collected.
+
+If a thread is selected in the top menu, then all cells in the matrix where
+that thread used CPU are highlighted.
+
+When the mouse pointer hovers over a cell in the matrix a profile is displayed
+showing which symbols were consuming CPU time on that CPU in that time slice.
-- 
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