add note on finding google calendar ID

diff --git a/README.org b/README.org
index 6817acca855afd19a80f259eda9468bf2deab0e6..788413bf9b58dc7318822991dfd208961d9f0c46 100644 (file)
--- a/README.org
+++ b/README.org
@@ -44,6 +44,10 @@ optional arguments:
   -l, --loop            keep running indefinitely
 #+END_EXAMPLE
 
+To find the google ID for a calendar, go to "Settings and Sharing" and
+then click (left-hand pane) or scroll to "Integrate calendar", and
+you'll there see "Calendar ID", which is what you want.
+
 ** Bugs / Limitations
 
 See [[file:NOTES.org][NOTES.org]] in the distribution for things that I know need doing;