diff --git a/README.md b/README.md
index 69a8481..3364e08 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,14 @@ Show user info
 
     v2ex user livid
 
+Open topic/node/user in your web browser (Mac only)
+
+    v2ex open t TOPIC_ID
+
+    v2ex open u USERNAME
+
+    v2ex open n NODE_NAME
+
 Show all nodes
 
     v2ex nodes
@@ -50,8 +58,6 @@ For more information, pass --help
 
 ## TODO
 
-Commands to open web pages to topics/users/nodes etc
-
 REPL mode (Read, Eval, Print, Loop)
 
 ## Contributing
diff --git a/bin/v2ex b/bin/v2ex
index a943ac4..72407fd 100755
--- a/bin/v2ex
+++ b/bin/v2ex
@@ -58,6 +58,20 @@ command :user do |c|
   end
 end
 
+command :open do |c|
+  c.syntax = 'v2ex open ARGS'
+  c.description = 'open topics/users/nodes in your browser'
+  c.action do |args, options|
+    case args.first
+    when 't' then `open #{v2ex_prefix}/t/#{args.last}`
+    when 'u' then `open #{v2ex_prefix}/member/#{args.last}`
+    when 'n' then `open #{v2ex_prefix}/go/#{args.last}`
+    else
+      puts "Wrong arguments. First argument should be 't', 'u' or 'n'."
+    end
+  end
+end
+
 command :nodes do |c|
   c.syntax = 'v2ex nodes'
   c.description = 'list all nodes'
@@ -93,11 +107,16 @@ def print_topic(topic, options={ :show_content => false })
   puts "\n#{topic[:content]}" if options[:show_content]
 end
 
+def v2ex_prefix
+  'http://www.v2ex.com'
+end
+
 alias_command :l, :latest
 alias_command :t, :topic
 alias_command :ut, :user_topics
 alias_command :nt, :node_topics
 alias_command :u, :user
 alias_command :n, :nodes
+alias_command :o, :open
 
 default_command :latest