diff --git a/README.md b/README.md
index 820b313..c0ce34a 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This is a conversion of the [log4js](http://log4js.berlios.de/index.html)
 framework to work with [node](http://nodejs.org). I've mainly stripped out the browser-specific code
 and tidied up some of the javascript. It includes a basic file logger, with log rolling based on file size, and also replaces node's console.log functions. 
 
-NOTE: in v0.2.x require('log4js') returned a function, and you needed to call that function in your code before you could use it. This was to make testing easier. v0.3.x make use of [felixge's sandbox-module](https://github.com/felixge/sandbox-module), so we don't need to return a function.
+NOTE: in v0.2.x require('log4js') returned a function, and you needed to call that function in your code before you could use it. This was to make testing easier. v0.3.x make use of [felixge's sandbox-module](https://github.com/felixge/node-sandboxed-module), so we don't need to return a function.
 
 ## installation
 
@@ -55,15 +55,9 @@ configuration file (`log4js.configure('path/to/file.json')`) explicitly, or just
 An example file can be found in `test/log4js.json`. An example config file with log rolling is in `test/with-log-rolling.json`
 You can also pass an object to the configure function, which has the same properties as the json versions.
 
-## todo
-
-patternLayout has no tests. This is mainly because I haven't found a use for it yet, 
-and am not entirely sure what it was supposed to do. It is more-or-less intact from 
-the original log4js.
-
 ## connect/express logger
 
-A connect/express logger has been added to log4js. This allows connect/express servers to log using log4js. See example-connect-logger.js. 
+A connect/express logger has been added to log4js, by [danbell](https://github.com/danbell). This allows connect/express servers to log using log4js. See example-connect-logger.js. 
 
     var log4js = require('./lib/log4js');
     log4js.addAppender(log4js.consoleAppender());
diff --git a/lib/layouts.js b/lib/layouts.js
index 57a231a..3a77aa0 100644
--- a/lib/layouts.js
+++ b/lib/layouts.js
@@ -120,7 +120,16 @@ function messagePassThroughLayout (loggingEvent) {
 
 /**
  * PatternLayout
- *
+ * Format for specifiers is %[padding].[truncation][field]{[format]}
+ * e.g. %5.10p - left pad the log level by 5 characters, up to a max of 10
+ * Fields can be any of:
+ *  - %r time in toLocaleTimeString format
+ *  - %p log level
+ *  - %c log category
+ *  - %m log data
+ *  - %d date in various formats
+ *  - %% %
+ *  - %n newline
  * Takes a pattern string and returns a layout function.
  * @author Stephan Strittmatter
  */