diff --git a/Readme.md b/Readme.md
index ed516e6..027aa82 100644
--- a/Readme.md
+++ b/Readme.md
@@ -31,16 +31,21 @@ Usage
     vsprintf('%d is the answer to %s', [42, what])
     // => '42 is the answer to life, the universe, and everything'
 
-Supported format specifiers: b, c, d, f, o, s, x, and X.
+    // you can format values as JSON with %j
+    var value = {answer: 42}
+    format('%j', value)
+    // => '{"answer":42}'
 
-See `man 3 printf` or `man 1 printf` for details.
+Supported format specifiers: b, c, d, f, j, o, s, x, and X.
+
+See `man 3 printf` or `man 1 printf` for details. `j` is an extension that formats values as JSON.
 
 Precision is supported for floating point numbers.
 
 License
 =======
 
-Copyright 2010 - 2014 Sami Samhuri sami@samhuri.net
+Copyright 2010 - 2016 Sami Samhuri sami@samhuri.net
 
 [MIT license](http://sjs.mit-license.org)