Improve README explanation of what is actually happening.

diff --git a/README.txt b/README.txt
index d0dfa365008421c9caacc12a2a8aaa9ae96ded7e..934c4df6c95edd72d77f99873274bbb01a226b6e 100644 (file)
--- a/README.txt
+++ b/README.txt
@@ -1,5 +1,19 @@
 Daily updated table of development of Berlin's Corona virus infections.
 
+How this works:
+
+Each day, the Berlin health ministry publishes by-district data of the day's
+registered new Corona infections at [1].  ./update.sh crawls this and appends
+the day's data as a single line to ./daily_infections_table.txt, then calls
+./enhance_table.py which outputs an enhanced version of the data to
+/var/www/html/berlin_corona.txt, which is served by my web server at [2].  A
+systemd timer whose files are provided as ./berlin-corona-table.service and
+./berlin-corona-table.timer calls ./update.sh once per day, when the new daily
+data are expected to be found at [1].
+
+[1] https://www.berlin.de/lageso/_assets/gesundheit/publikationen/corona/bezirkstabelle.csv 
+[2] https://plomlompom.com/berlin_corona.txt
+
 Set-up:
 
 sudo cp berlin-corona-table.service /etc/systemd/system/