diff --git a/docs/how-to-survive.md b/docs/how-to-survive.md
index 7defee5a36114a4bebfb6fbf6ebad8f7c5890d67..fae34c2d6a89e870baff6363c69f88625b8ac459 100644
--- a/docs/how-to-survive.md
+++ b/docs/how-to-survive.md
@@ -7,6 +7,7 @@
 * stable tent pegs (best use v-profile ones)
 * a sleeping bag
 * a mattress and a sleeping pad. Maybe a cushion.
+* a sleeping mask if you are sensitive to light.
 * a drinking bottle. Drink more water - drinking not enough (water! not mate, not beer!) is the most common DoS-Attack at camps.
 * a rescue blanket: One of those silvery blankets you find in first aid kits. They are very good at reflecting sunlight away from your computer monitor, so you'll be able to hack during the day. Most tents let in a *lot* of light and rescue blankets are one of the cheaper ways to fix that.
 * blanket to sit on and place your laptop on. You might not want to sit on a dew covered ground in the morning