diff --git a/README.md b/README.md
index 3a73dcc..fc27443 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,4 @@ A check script for icinga2 to check for the existance of
 
     /var/run/reboot-required.pkgs
 
+If this file exists, a reboot of the machine is required. See https://askubuntu.com/questions/28530/how-can-i-tell-what-package-requires-a-reboot-of-my-system/28537#28537.
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