diff --git a/README.md b/README.md
index 005c16a..6c3946b 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,17 @@ Known Issues
 
 * missing setup
 
+* "Warning: Authentication failure. Retrying..." during vagrant up
+
+  * ctrl-C or wait till it ends
+  * edit Vagrantfile to change config.ssh.private_key_path to a private key of yours and be sure it is added to your ssh-agent
+  * ssh vagrant@localhost -p 2222  (password: vagrant)
+    * sudo su - act_developer
+    * edit .ssh/authorized_keys to add the public key of the key in config.ssh.private_key_path
+  * vagrant halt
+  * vagrant up
+
+
 Acknowledgements
 ================