diff --git a/plone/app/discussion/browser/captcha.py b/plone/app/discussion/browser/captcha.py
index a0e3105..36e216c 100644
--- a/plone/app/discussion/browser/captcha.py
+++ b/plone/app/discussion/browser/captcha.py
@@ -7,21 +7,23 @@ from zope import interface, schema
 from zope.annotation import factory
 from zope.annotation.attribute import AttributeAnnotations
 
-from zope.component import adapts, provideAdapter
-
+from zope.component import adapts, provideAdapter, queryUtility
 from zope.publisher.interfaces.browser import IDefaultBrowserLayer
 
 from zope.interface import Interface, implements
 
+from plone.registry.interfaces import IRegistry
+
 from plone.z3cform.fieldsets import extensible
 from plone.z3cform.fieldsets.interfaces import IFormExtender
 
-from plone.app.discussion.comment import Comment
 from plone.app.discussion.browser.comments import CommentForm
+from plone.app.discussion.comment import Comment
+from plone.app.discussion.interfaces import IDiscussionSettings
 
 class ICaptcha(Interface):
-    captcha = schema.TextLine(title=u"Type the word 'human' in all capital letters.",
-                              required=False)
+    captcha = schema.TextLine(title=u"Captcha",
+                              required=True)
 
 class Captcha(Persistent):
     interface.implements(ICaptcha)
@@ -40,6 +42,15 @@ class CaptchaExtender(extensible.FormExtender):
         self.request = request
         self.form = form
 
+        registry = queryUtility(IRegistry)
+        settings = registry.forInterface(IDiscussionSettings)
+        self.captcha = settings.captcha
+
     def update(self):
-        # Add all fields from the captcha interface
-        self.add(ICaptcha, prefix="extra")
\ No newline at end of file
+        if self.captcha != 'disabled':
+            # Add all fields from the captcha interface
+            self.add(ICaptcha, prefix="")
+            if self.captcha == 'captcha':
+                self.form.fields['captcha'].widgetFactory = CaptchaFieldWidget
+            elif self.captcha == 'recaptcha':
+                self.form.fields['captcha'].widgetFactory = ReCaptchaFieldWidget
\ No newline at end of file
diff --git a/plone/app/discussion/configure.zcml b/plone/app/discussion/configure.zcml
index 4c5e1d0..4c6aa72 100644
--- a/plone/app/discussion/configure.zcml
+++ b/plone/app/discussion/configure.zcml
@@ -71,6 +71,10 @@
         handler=".tool.unindex_object"
         />
 
+    <!-- Captcha Vocabulary -->
+    <utility component=".vocabularies.captcha_vocabulary"
+           name="plone.app.discussion.vocabularies.CaptchaVocabulary" />
+
     <!-- Conversation indexes -->
     <adapter name="total_comments" factory=".catalog.total_comments" />
     <adapter name="last_comment_date" factory=".catalog.last_comment_date" />
@@ -89,4 +93,4 @@
     <adapter name="last_comment_date" factory=".catalog.comments_last_comment_date" />
     <adapter name="commentators" factory=".catalog.comments_commentators" />
 
-</configure>
+</configure>
\ No newline at end of file
diff --git a/plone/app/discussion/interfaces.py b/plone/app/discussion/interfaces.py
index f12c80f..b87bfd9 100644
--- a/plone/app/discussion/interfaces.py
+++ b/plone/app/discussion/interfaces.py
@@ -25,6 +25,14 @@ class IDiscussionSettings(Interface):
                                      description=_(u"Use this setting to enable or disable posting comments as anonymous visitor."),
                                      default=False)
 
+    captcha = schema.Choice(title=_(u"Captcha"),
+                            description=_(u"""Use this setting to enable or disable captcha validation for comments.
+                                              If no captcha options are available, install captcha solutions like
+                                              plone.formwidget.captcha or plone.formwidget.recaptcha."""),
+                            required=True,
+                            default='disabled',
+                            vocabulary='plone.app.discussion.vocabularies.CaptchaVocabulary',)
+
     show_commenter_image = schema.Bool(title=_(u"Show commenter image"),
                                        description=_(u"Use this setting to enable or disable showing the commenter's image next to his/her comments."),
                                        default=True)
diff --git a/plone/app/discussion/tests/test_controlpanel.py b/plone/app/discussion/tests/test_controlpanel.py
index c6c3e60..88f231a 100644
--- a/plone/app/discussion/tests/test_controlpanel.py
+++ b/plone/app/discussion/tests/test_controlpanel.py
@@ -1,5 +1,7 @@
 import unittest
 
+from zope.component import getMultiAdapter
+
 from plone.registry import Registry
 
 from Products.CMFCore.utils import getToolByName
@@ -31,6 +33,13 @@ class RegistryTest(PloneTestCase):
         self.failUnless('globally_enabled' in IDiscussionSettings)
         self.assertEquals(self.registry['plone.app.discussion.interfaces.IDiscussionSettings.globally_enabled'], True)
 
+    def test_captcha(self):
+        # Check globally_enabled record
+        globally_enabled_record = self.registry.records['plone.app.discussion.interfaces.IDiscussionSettings.captcha']
+
+        self.failUnless('captcha' in IDiscussionSettings)
+        self.assertEquals(self.registry['plone.app.discussion.interfaces.IDiscussionSettings.captcha'], 'disabled')
+
     def test_anonymous_comments(self):
         # Check anonymous_comments record
         anonymous_comments_record = self.registry.records['plone.app.discussion.interfaces.IDiscussionSettings.anonymous_comments']
diff --git a/plone/app/discussion/vocabularies.py b/plone/app/discussion/vocabularies.py
new file mode 100644
index 0000000..155c8e7
--- /dev/null
+++ b/plone/app/discussion/vocabularies.py
@@ -0,0 +1,48 @@
+from zope import interface
+from zope import component
+import zope.schema.interfaces
+import zope.schema.vocabulary
+
+# XXX: REPLACE THIS!!!
+HAS_CAPTCHA=False
+HAS_RECAPTCHA=False
+
+try:
+     from plone.formwidget.captcha.widget import CaptchaFieldWidget
+     HAS_CAPTCHA = True
+except ImportError:
+    pass
+
+try:
+     from plone.formwidget.captcha.widget import ReCaptchaFieldWidget
+     HAS_RECAPTCHA = True
+except ImportError:
+    pass
+# XXX: REPLACE THIS!!!
+
+def captcha_vocabulary(context):
+    """Vocabulary with all available captcha implementations.
+    """
+    terms = []
+    terms.append(
+        zope.schema.vocabulary.SimpleTerm(
+            value='disabled',
+            token='disabled',
+            title='Disabled'))
+
+    if HAS_CAPTCHA:
+        terms.append(
+            zope.schema.vocabulary.SimpleTerm(
+                value='captcha',
+                token='captcha',
+                title='Captcha'))
+    if HAS_RECAPTCHA:
+        terms.append(
+            zope.schema.vocabulary.SimpleTerm(
+                value='recaptcha',
+                token='recaptcha',
+                title='ReCaptcha'))
+    return zope.schema.vocabulary.SimpleVocabulary(terms)
+
+interface.alsoProvides(captcha_vocabulary,
+                       zope.schema.interfaces.IVocabularyFactory)
\ No newline at end of file