diff --git a/lib/class_abstract.js b/lib/class_abstract.js
index 06cd3eb..a0cfa0b 100644
--- a/lib/class_abstract.js
+++ b/lib/class_abstract.js
@@ -29,6 +29,11 @@
 var Class = require( __dirname + '/class' );
 
 
+/**
+ * Creates an abstract class
+ *
+ * @return  {Class}  abstract class
+ */
 module.exports = exports = function()
 {
     markAbstract( arguments );
@@ -38,19 +43,31 @@ module.exports = exports = function()
 };
 
 
+/**
+ * Creates an abstract class from a class extend operation
+ *
+ * @return  {Class}  abstract class
+ */
 exports.extend = function()
 {
     markAbstract( arguments );
-
     return Class.extend.apply( this, arguments );
 };
 
 
+/**
+ * Creates an abstract class implementing the given members
+ *
+ * Simply wraps the class module's implement() method.
+ *
+ * @return  {Object}  abstract class
+ */
 exports.implement = function()
 {
     var impl   = Class.implement.apply( this, arguments ),
         extend = impl.extend;
 
+    // wrap extend, applying the abstract flag
     impl.extend = function()
     {
         markAbstract( arguments );
@@ -61,6 +78,16 @@ exports.implement = function()
 };
 
 
+/**
+ * Causes a definition to be flagged as abstract
+ *
+ * This function assumes the last argument to be the definition, which is the
+ * common case, and modifies the object referenced by that argument.
+ *
+ * @param  {arguments}  args  arguments to parse
+ *
+ * @return  {undefined}
+ */
 function markAbstract( args )
 {
     // the last argument _should_ be the definition