diff --git a/Gemfile b/Gemfile
index 12a0ee5..27cb09f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,3 +11,4 @@ gem 'builder'
 gem 'rb-fsevent'
 gem 'guard'
 gem 'guard-nanoc'
+gem 'growl'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1bb5212..9abac3c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,6 +14,7 @@ GEM
       addressable (~> 2.2.2)
       multipart-post (~> 1.1.0)
       rack (>= 1.1.0, < 2)
+    growl (1.0.3)
     guard (0.3.0)
       open_gem (~> 1.4.2)
       thor (~> 0.14.6)
@@ -52,6 +53,7 @@ PLATFORMS
 DEPENDENCIES
   bitly
   builder
+  growl
   guard
   guard-nanoc
   haml