diff --git a/README.md b/README.md
index 56fe034..ff40030 100644
--- a/README.md
+++ b/README.md
@@ -16,3 +16,7 @@ There is a probe project included, this line is taken from there:
 ```
 IWatcher watcher = new Watcher("testApp", Resolution.HalfMinute, SavePreference.KeepDataForToday, DataPrecision.HighPrecision);
 ```
+Then you can just ask, also from the probe project:
+~~~
+TimeSpan usage = watcher.UsageForGivenTimeframe(startTime, startTime + TimeSpan.FromDays(1));
+~~~