diff --git a/README.md b/README.md
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+++ b/README.md
@@ -56,6 +56,7 @@ You'll also find a list of all the nice humans who have contributed to this list
 - Feed the guinea pigs.
 - Water your plants.
 - Clean your coffee-machine and take out the trash.
+- Close all windows and set all radiator thermostats
 - When bringing credit cards and not living in Germany: call your bank and have them pre-approve payments from Germany. Otherwise, your bank may decline all purchases when they don't know you're traveling and suspect fraud.
 - Stock you pantry/freezer with some food that keeps so you have something to eat when you get home (that doesn't rely on shops/restaurants being open).
 - (optional but recommended) Visit the [congress overview page][53], create account in the [congress wiki][12], [add your projects][13], [find your assembly][14] and join the [38C3 chat][54].