diff --git a/config-example.yaml b/config-example.yaml
index dc4bd579..692c605a 100644
--- a/config-example.yaml
+++ b/config-example.yaml
@@ -6,6 +6,10 @@ server_url: http://127.0.0.1:8080
 # Address to listen to / bind to on the server
 listen_addr: 0.0.0.0:8080
 
+# Private key file which will be
+# autogenerated if it's missing
+private_key_path: private.key
+
 derp:
   # List of externally available DERP maps encoded in JSON
   urls: