diff --git a/README.md b/README.md
index 2c47d56..679df58 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,8 @@ Quorum examples.
   1. Install [VirtualBox](https://www.virtualbox.org/wiki/Downloads)
   1. Install [Vagrant](https://www.vagrantup.com/downloads.html)
 
+(If you are behind a proxy server, please see https://github.com/jpmorganchase/quorum/issues/23.)
+
 ### Running
 
 ```sh