diff --git a/README.md b/README.md
index 85f6d03..3f51cc2 100644
--- a/README.md
+++ b/README.md
@@ -143,11 +143,12 @@ fields:
 - `timestamp`: the time of the report
 
 Each report carries only the samples no earlier report has delivered. A sample
-waits only as long as the history holds it: the last 100 rounds of each host.
-The samples an interval change clears wait apart, the last 100 of each host,
-until they are delivered. Nothing is sent while the page is paused. A report
-with no answer after 30 seconds is abandoned, and its samples go in the next
-one. So a server that stored them but answered late gets them twice.
+waits as long as the history holds it: the last 100 rounds of each host. An
+interval change clears the history. The cleared samples are kept, the last 100
+of each host, until a report delivers them. Nothing is sent while the page is
+paused. A report with no answer after 30 seconds is abandoned, and its samples
+go in the next one. So a server that stored them but answered late gets them
+twice.
 
 A failed delivery is quiet, as on a static file host with no backend: one debug
 log line when deliveries start failing, one when they recover. The checks go on.