diff --git a/Admin-manual.md b/Admin-manual.md
index ef30e3c..af33889 100644
--- a/Admin-manual.md
+++ b/Admin-manual.md
@@ -69,4 +69,8 @@ Create a new json file. This must be accessable via the web via a static url as
 
 ## Setup installation keys
 
-tba
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+Installation keys allows the client for the end-use to download extra files wich should only be available to certain users. E.g. for private servers only.
+
+To be able to provide installation keys (in form of serial keys, email addresses or whatever you want), you need to provide an Unleash Api entpoint with one feature named `allow-extras` which checks userids. This need you to fork this repo and deploy your own version of the modpack updater aswell as your own Unleash server or GitLab features.
+
+Instead of deploying your own server and your own modpack installer version, you can also create a ticket and provide me a list of keys and your modpack key.
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