diff --git a/README.md b/README.md
index b34c01c..6a332a4 100644
--- a/README.md
+++ b/README.md
@@ -1,15 +1,21 @@
 It's a [Guard](http://github.com/guard/guard) for the [Rocco](http://github.com/rtomayko/rocco) documentation system!
 
-    guard 'rocco' do
-      watch(%r{^app/.*\.(rb|coffee)$})
-      watch(%r{^lib/.*\.rb$})
-    end
-
+``` ruby
+# default values
+guard 'rocco', :run_on => [:start, :change], :dir => 'doc', :stylesheet => 'http://jashkenas.github.com/docco/resources/docco.css' do
+  watch(%r{^app/.*\.(rb|coffee)$})
+  watch(%r{^lib/.*\.rb$})
+end
+```
 Options:
 
-* `:dir` specifies the output dir (default `doc`)
-* `:stylesheet` specifies a custom stylesheet to use (default is
-  http://jashkenas.github.com/docco/resources/docco.css)
+* `:run_on` specifies when to update the docs
+  * `:start` - run on all documentation when the guard starts
+  * `:change` - run when watched files change
+  * `:reload` - run when the guard is reloaded
+  * `:all` - run when running all the guards
+* `:dir` specifies the output dir
+* `:stylesheet` specifies a custom stylesheet to use
 
 `gem install guard-rocco` or Bundle it up with `gem 'guard-rocco'`. Then `guard init rocco`. Yeah!
 
diff --git a/lib/guard/rocco.rb b/lib/guard/rocco.rb
index ada419d..d5842d1 100644
--- a/lib/guard/rocco.rb
+++ b/lib/guard/rocco.rb
@@ -9,19 +9,27 @@ module Guard
     def initialize(watchers = [], options = {})
       super
 
-      @options = { :dir => 'doc' }.merge(options)
+      @options = options || {}
+
+      @dir = @options[:dir] || 'doc'
+      @run_on = @options[:run_on] || [:start, :change]
+      @run_on = [@run_on] unless @run_on.respond_to?(:include?)
     end
 
     def start
-      UI.info "Guard::Rocco is waiting to build docs..."
+      all_paths.each { |path| build(path) } if run_for? :start
+    end
+
+    def reload
+      all_paths.each { |path| build(path) } if run_for? :reload
     end
 
     def run_all
-      all_paths.each { |path| build(path) }
+      all_paths.each { |path| build(path) } if run_for? :all
     end
 
     def run_on_change(paths = [])
-      paths.each { |path| build(path) }
+      paths.each { |path| build(path) } if run_for? :change
     end
 
     private
@@ -39,14 +47,18 @@ module Guard
     end
 
     def filename_to_target(path)
-      File.join(@options[:dir], path).gsub(%r{\.[^\.]+$}, '.html')
+      File.join(@dir, path).gsub(%r{\.[^\.]+$}, '.html')
     end
 
     def rocco_options
       opts = @options.dup
       opts.delete(:dir)
+      opts.delete(:run_on)
       opts
     end
+
+    def run_for? command
+      @run_on.include?(command)
+    end
   end
 end
-
diff --git a/spec/lib/guard/rocco_spec.rb b/spec/lib/guard/rocco_spec.rb
index cab5520..a1c4a69 100644
--- a/spec/lib/guard/rocco_spec.rb
+++ b/spec/lib/guard/rocco_spec.rb
@@ -36,5 +36,19 @@ describe Guard::Rocco do
       File.file?(File.join(doc_dir, 'lib/guard/rocco.html')).should be_true
     end
   end
+  
+  describe 'run options' do
+    it 'should allow array of symbols' do
+      guard = Guard::Rocco.new([], :run_on => [:start, :change])
+      guard.run_for?(:start).should be_true
+      guard.run_for?(:reload).should be_false
+    end
+
+    it 'should allow symbol' do
+      guard = Guard::RailsAssets.new([], :run_on => :start)
+      guard.run_for?(:start).should be_true
+      guard.run_for?(:reload).should be_false
+    end
+  end
 end