diff --git a/README.md b/README.md
index 74f121d..545c72a 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,14 @@
 JRuby Sandbox
 =============
 
-The JRuby sandbox is a reimplementation of _why's freaky freaky sandbox
+The JRuby sandbox is a reimplementation of \_why's freaky freaky sandbox
 in JRuby, and is heavily based on [javasand][1] by Ola Bini, but updated
 for JRuby 1.6.
 
+## Installation
+
+    gem install jruby_sandbox
+
 ## Prerequisites
 
 This gem requires JRuby 1.6. As of the time of this writing, it is known to
@@ -40,6 +44,8 @@ core libraries.  Note that this is a direct binding to `Kernel#require`,
 so it will only load ruby stdlib libraries (i.e. no rubygems support
 yet).
 
+Note that all code in the sandbox will be interpreted in Ruby 1.9 mode.
+
 ## Sandbox::Safe usage
 
 Sandbox::Safe exposes an `#activate!` method which will lock down the sandbox, removing unsafe methods.  Before calling `#activate!`, Sandbox::Safe is the same as Sandbox::Full.