Update README-Tutorial.md
diff --git a/xos/configurations/cord-pod/README-Tutorial.md b/xos/configurations/cord-pod/README-Tutorial.md
index b07d19c..1e3def3 100644
--- a/xos/configurations/cord-pod/README-Tutorial.md
+++ b/xos/configurations/cord-pod/README-Tutorial.md
@@ -63,6 +63,16 @@
- ./id_rsa:/opt/xos/synchronizers/exampleservice/exampleservice_private_key:ro
```
+Also, add ExampleService's public key to the `volumes` section of the `xos` docker container:
+
+```
+xos:
+ ...
+ volumes:
+ ...
+ - ./id_rsa.pub:/opt/xos/synchronizers/exampleservice/exampleservice_public_key:ro
+```
+
## Bring up XOS
Under the `cord-pod` configuration, edit file `make-vtn-networkconfig-json.sh`.