diff --git a/.gitignore b/.gitignore
index c111b33..2fd16c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
+*.ps
 *.gem
+.DS_Store
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..01621bf
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+gem uninstall diverge --ignore-dependencies
+gem build diverge.gemspec && gem install diverge --no-rdoc --no-ri --ignore-dependencies && ruby -e "require 'diverge'"
diff --git a/diverge.gemspec b/diverge.gemspec
index 0dcf634..e78acd7 100644
--- a/diverge.gemspec
+++ b/diverge.gemspec
@@ -1,10 +1,12 @@
 Gem::Specification.new do |spec|
   spec.name        = "diverge"
-  spec.version     = "1.0.4"
+  spec.version     = "1.1.0"
   spec.summary     = "Distribution divergences."
   spec.description = "A simple collection of functions for determining the divergence between two distributions."
   spec.authors     = ["Evan Senter"]
   spec.email       = "evansenter@gmail.com"
   spec.files       = Dir["{lib}/**/*.rb", "bin/*", "LICENSE", "*.md"]
   spec.homepage    = "http://rubygems.org/gems/diverge"
+  
+  spec.add_dependency("gsl", [">= 1.14.0"])
 end
\ No newline at end of file
diff --git a/lib/diverge.rb b/lib/diverge.rb
index 2cb1418..149fec6 100644
--- a/lib/diverge.rb
+++ b/lib/diverge.rb
@@ -1,3 +1,5 @@
+require "gsl"
+
 class Diverge
   attr_reader :p, :q
   
@@ -40,4 +42,10 @@ def total_variation_distance
   end
   
   alias :tvd :total_variation_distance
+  
+  def correlation
+    GSL::Stats::correlation(GSL::Vector.alloc(p), GSL::Vector.alloc(q))
+  end
+  
+  alias :corr :correlation
 end
\ No newline at end of file