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+++ b/README.markdown
@@ -17,3 +17,32 @@ From github, download the module into your modulepath on your Puppetmaster. If y
   puppet --configprint modulepath
 
 Depending on the version of Puppet, you may need to restart the puppetmasterd (or Apache) process before the functions will work.
+
+## Functions
+
+### kwalify
+
+This function allows you to validate Puppet data structures using Kwalify 
+schemas as documented here:
+
+http://www.kuwata-lab.com/kwalify/ruby/users-guide.01.html
+
+To validate, create a schema in Puppet:
+
+    $schema = {
+      'type' => 'seq',
+      'sequence' => [
+        { 'type' => 'str' }
+      ]
+    }
+
+And create some content that you want validated:
+
+    $document = ['a', 'b', 'c']
+
+And then use the function to validate:
+
+    kwalify($schema, $document)
+
+The function will throw an error and list all validation errors if there is a
+problem otherwise it succeeds silently.