diff --git a/README.rdoc b/README.rdoc
index 2dd4b31..95fec99 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -41,6 +41,7 @@ Runtime Options:
   -s, [--sudo]          # Use sudo for the gem install commands (for non rvm/osx users)
   -u, [--url]           # Rool url for your app in development
   -C, [--cucumber]      # Include cucumber tests, currently does not support oauth
+  -j, [--jslibrary]     # write out javascript partials using the jquery or prototype. will default to prototype if Rails.version < 3.1.x
   
 Devise Options (used with the -c command)
 
diff --git a/devisable.gemspec b/devisable.gemspec
index 719109c..6010cb4 100644
--- a/devisable.gemspec
+++ b/devisable.gemspec
@@ -5,7 +5,7 @@
 
 Gem::Specification.new do |s|
   s.name = %q{devisable}
-  s.version = "0.1.3"
+  s.version = "0.2.0"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Scott Sampson", "Jeremiah Hemphill"]
diff --git a/lib/generators/devisable/devisable_generator.rb b/lib/generators/devisable/devisable_generator.rb
index 653497f..0fabe3e 100644
--- a/lib/generators/devisable/devisable_generator.rb
+++ b/lib/generators/devisable/devisable_generator.rb
@@ -93,11 +93,11 @@ def initialize(*runtime_args)
         @@actual_configuration_options['cucumber'] = true
       end
       opts.on("-j", "--jslibrary (jquery|prototype)", String, "write out using the jquery or prototype libraries") do |j|
-        if j =~ /jquery/i
-          @@actual_configuration_options['jslibrary'] = 'jquery'
-        elsif j =~ /prototype/i
-          @@actual_configuration_options['jslibrary'] = 'prototype'
-        end
+        # otherwise use command lines options
+        lib = 'jquery' if j =~ /jquery/i
+        lib = 'prototype' if j =~ /prototype/i
+
+        @@actual_configuration_options['jslibrary'] = lib
       end
     end.parse!
     execute
@@ -408,6 +408,13 @@ def new_project
   
   #adds the javascript for the role permissions checkboxes
   def add_javascript
+    # if no jslibrary has been selected yet
+    if @@actual_configuration_options['jslibrary'] == ''
+      # if the version is >= 3.1.0, then jquery is the default. otherwise, prototype
+      version = Rails.version.split('.').collect{|t|t.to_i}
+      @@actual_configuration_options['jslibrary'] = (version[0] >= 3 && version[1] >= 1) ? 'jquery' : 'prototype'
+    end
+
     rep_str = load_erb_string('partials/_permission_manage_' + @@actual_configuration_options['jslibrary'] + '.js')
     append_to_file "public/javascripts/application.js", rep_str
   end