diff --git a/modules/qualifying/exercise_broken_machines.md b/modules/qualifying/exercise_broken_machines.md
index df0dedc..c578c52 100644
--- a/modules/qualifying/exercise_broken_machines.md
+++ b/modules/qualifying/exercise_broken_machines.md
@@ -40,10 +40,15 @@ There must be a way to fix this without having to reinstall the machine.
 
 #### Tips
 
+<details>
+  <summary>Spoiler warning</summary>
+
 Your GRUB configuration is causing this!
 Luckily by default GRUB offers a *recovery mode* in it's *advanced options*.
 This will drop you into a shell where you can fix the configuration file I messed up.
 
+</details>
+
 ### Broken Machine 3
 
 Not `htop` again!
@@ -52,9 +57,14 @@ Not `htop` again!
 
 #### Tips
 
+<details>
+  <summary>Spoiler warning</summary>
+
 I said *by default* before no?
 Well, here the *recovery mode* is missing so you'll have to find a way to override the `init` parameter of GRUB so you can get a shell to fix what I messed up.
 
+</details>
+
 ### Broken Machine 4
 
 I forgot my password...
@@ -63,10 +73,14 @@ I forgot my password...
 
 #### Tips
 
+<details>
+  <summary>Spoiler warning</summary>
+
 Overriding the `init` parameter in GRUB is a classic Linux hack.
 If you have physical access to a Linux machine you can gain `root` access with the following method.
 The easiest way to protect a machine form this attack is to do full disk encryption or to set a GRUB password.
 
+</details>
 
 ## Disks and problems