Update README.md

README.md

@@ -129,7 +129,7 @@ sudo apt install bluetooth bluez libbluetooth-dev -y
  * -a (--average) Affects MRTG output. The parameter is a number of minutes. 0 simply returns the last value in the log file. Any number more than zero will average the entries over that number of minutes. If no entries were logged in that time period, no results are returned. MRTG graphing is then determined by the setting of the unknaszero option in the MRTG.conf file.
  * -d (--download) download the 20 days historical data from each device. This is still very much a work in progress.
  * -s (--svg) SVG output directory. Writes four SVG files per device to this directory every 5 minutes that can be used in standard web page. 
- * -i (--index) HTML index file for SVG files, must be paired with log directory. HTML file is a fully qualified name. This is meant as a one time run option just to create a simple index of all the SVG files.
+ * -i (--index) HTML index file for SVG files, must be paired with log directory. HTML file is a fully qualified name. This is meant as a one time run option just to create a simple index of all the SVG files. The program will exit after creating the index file.
  * -T (--titlemap) SVG-title fully-qualified-filename. A mapfile with bluetooth addresses as the beginning of each line, and a replacement title to be used in the SVG graph.
  * -c (--celsius) SVG output using degrees C
  * -b (--battery) Draw the battery status on SVG graphs. 1:daily, 2:weekly, 4:monthly, 8:yearly