diff --git a/README.md b/README.md
index 169d810..622ea03 100644
--- a/README.md
+++ b/README.md
@@ -129,10 +129,10 @@
 * Copy the `devtimer.py` and `tm1637.py` files onto your
   Pi Zero.  You can then start the timer with `./devtimer.py`.
 
-* By default, the code currently writes a lot of debug info to
-  the Pi's tty so you can watch all manner of things fly by.
-  If it bugs you, just change `DEBUG` to `False` at the top of the
-  code.
+* The DEBUG variable turns debug out to the console on- and off.
+  It's for use by the developer and should be left set to `False`.
+  Enabling this significanly interferes with the timer's accuracy
+  at least on small footprint machines like the Pi Zero.
 
 
 ## Operating The Timer