From 7fd5ceeb053d3bac08bbbe4846023a2f78e0edb7 Mon Sep 17 00:00:00 2001
From: Artur Roszczyk <artur.roszczyk@gmail.com>
Date: Sat, 8 Jun 2013 14:46:15 +0300
Subject: [PATCH] Update README.md

Add description of custom IP resolver
---
 README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.md b/README.md
index 0f11188..e9f1184 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,25 @@ Use:
 config.vm.provision :hostmanager
 ```
 
+Custom IP resolver
+------------------
+
+You can customize way, how host manager resolves IP address
+for each machine. This might be handy in case of aws provider,
+where host name is stored in ssh_info hash of each machine.
+This causes generation of invalid /etc/hosts file.
+
+Custom IP resolver gives you oportunity to calculate IP address
+for each machine by yourself. For example:
+
+```ruby
+config.hostmanager.ip_resolver = proc do |vm|
+  if hostname = (vm.ssh_info && vm.ssh_info[:host])
+    `host #{hostname}`.split("\n").last[/(\d+\.\d+\.\d+\.\d+)/, 1]
+  end
+end
+```
+
 Contribute
 ----------
 Contributions are welcome.