Index: documentation/manual/en/module_specs/Zend_Captcha-Adapters.xml
===================================================================
--- documentation/manual/en/module_specs/Zend_Captcha-Adapters.xml	(revision 23572)
+++ documentation/manual/en/module_specs/Zend_Captcha-Adapters.xml	(working copy)
@@ -300,6 +300,28 @@
                     the ReCaptcha service object.
                 </para>
             </listitem>
+            
+            <listitem>
+                <para>
+                    <methodname>isValid($value, $context = null)</methodname> validates the user's
+                    input against the ReCaptcha service.  $value is an array with the following
+                    keys:  
+                    <itemizedlist>
+                        <listitem>
+                            <para>
+                                recaptcha_challenge_field - Value of the ReCaptcha widget's 
+                                challenge field (hidden)
+                            </para>
+                        </listitem>
+                        <listitem>                        
+                            <para>
+                                recaptcha_response_field - Value of the ReCaptcha widget's
+                                user input field
+                            </para>
+                        </listitem>
+                    </itemizedlist>
+                </para>
+            </listitem>
         </itemizedlist>
     </sect2>
 </sect1>