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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -18,3 +18,25 @@ This executable needs some parameters to work properly:
 | `-username` | No | Name of our user, as used e.g. in salutation. No length or charset limitation. *Default: Player 1* |
 | `-accessCode` | Yes | Access code for the user. *Default: AllYourCodesAreBelongToUs* |
 | `-sessionSalt` | Yes | Variable to salt the session token generator with. |
+| `-seedFile` | Yes | JSON file to read challenge information from. |
+
+## Seed file
+
+The seed file should be of the following format:
+
+```
+{
+  "challenges": [
+    {
+      "name": "Evil Service",
+      "description": "A meaningful and funny description",
+      "flag": "CIRCUS[IS_REALLY_COOL]",
+      "container": "challenge-evilservice",
+      "category": "Miscellaneous"
+    },
+    {
+      "name": "Insecure Stuff",
+      [...]
+  ]
+}
+```