diff --git a/docs/grml-live.txt b/docs/grml-live.txt
index da845af0..ee3856f0 100644
--- a/docs/grml-live.txt
+++ b/docs/grml-live.txt
@@ -536,7 +536,7 @@ Instructions
   EOF
 
   # get keyring for apt:
-  apt-get update
+  apt-get -o Acquire::AllowInsecureRepositories=true update
   apt-get --allow-unauthenticated install grml-debian-keyring
 
   # optionally(!) install basefile so we don't have to build basic