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diff --git a/README.md b/README.md
index 483bc95..55398d1 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,11 @@ Then run borger:
 As simply as
 
     borger servername --check
+
+# WARNING
+
+Borger uses `keyfile` encrytion by default. That means **you should backup your keyfile**
+somewhere else. **If you don't want that, use `encryption="repokey"` at your config.**
+
+See [Repository Encryption](https://borgbackup.readthedocs.io/en/stable/quickstart.html#repository-encryption)
+for details.