diff --git a/modules/qualifying/exercise_broken_machines.md b/modules/qualifying/exercise_broken_machines.md
index 0fb97c1..df0dedc 100644
--- a/modules/qualifying/exercise_broken_machines.md
+++ b/modules/qualifying/exercise_broken_machines.md
@@ -16,6 +16,9 @@ Thanks!
 
 #### Tips
 
+<details>
+  <summary>Spoiler warning</summary>
+
 How did this happen?
 Well, you probably encountered the *black screen of death* on one or more Linux VM's yourself.
 When at the very last stage of the Debian installation you forget to install GRUB you created this problem yourself.
@@ -26,6 +29,8 @@ You need to install GRUB on the MBR of the HDD `/dev/sda`.
 Luckily there are dedicated live disk images (ISO's) to fix this.
 I would recommend having a look at [supergrub2](https://www.supergrubdisk.org/).
 
+</details>
+
 ### Broken Machine 2
 
 This machine seems to boot into `htop` and nothing else!