diff --git a/README.mkd b/README.mkd
index dc22023..30253c6 100644
--- a/README.mkd
+++ b/README.mkd
@@ -7,6 +7,7 @@ Teamocil is a tool used to automatically create windows and splits in `tmux` wit
     $ gem install teamocil
     $ mkdir ~/.teamocil
     $ touch ~/.teamocil/sample.yml
+    $ tmux
     $ teamocil sample
 
 # Layout example
diff --git a/bin/teamocil b/bin/teamocil
index 2c9b4e1..9bf3c9a 100755
--- a/bin/teamocil
+++ b/bin/teamocil
@@ -1,6 +1,10 @@
 #!/usr/bin/env ruby
 
-require "teamocil"
+require File.dirname(__FILE__)+"/../lib/teamocil"
 
-layout = Teamocil::Layout.new(ARGV[0], File.join("#{ENV["HOME"]}/.teamocil", "#{ARGV[0]}.yml"))
-layout.to_tmux
+if ENV["TMUX"] == nil
+  puts "You must be in a tmux session to use teamocil"
+else
+  layout = Teamocil::Layout.new(ARGV[0], File.join("#{ENV["HOME"]}/.teamocil", "#{ARGV[0]}.yml"))
+  layout.to_tmux
+end