diff --git a/README.txt b/README.txt
index 1726e86..a39e2f0 100644
--- a/README.txt
+++ b/README.txt
@@ -14,63 +14,63 @@ interface from z3c.formwidget.query and have a search() method.
 
 Example Usage::
 
-	from zope.component import adapts
-	from zope.interface import Interface, implements
-	from zope import schema
+    from zope.component import adapts
+    from zope.interface import Interface, implements
+    from zope import schema
 
-	from plone.z3cform import layout
+    from plone.z3cform import layout
 
-	from z3c.form import form, button, field
+    from z3c.form import form, button, field
 
-	from plone.formwidget.contenttree import ContentTreeFieldWidget
-	from plone.formwidget.contenttree import MultiContentTreeFieldWidget
-	from plone.formwidget.contenttree import PathSourceBinder
+    from plone.formwidget.contenttree import ContentTreeFieldWidget
+    from plone.formwidget.contenttree import MultiContentTreeFieldWidget
+    from plone.formwidget.contenttree import PathSourceBinder
 
 
-	class ITestForm(Interface):
+    class ITestForm(Interface):
 
-	    buddy = schema.Choice(title=u"Buddy object",
-	                          description=u"Select one, please",
-	                          source=PathSourceBinder(portal_type='Document'))
+        buddy = schema.Choice(title=u"Buddy object",
+                              description=u"Select one, please",
+                              source=PathSourceBinder(portal_type='Document'))
 
-	    friends = schema.List(
-	        title=u"Friend objects",
-	        description=u"Select as many as you want",
-	        value_type=schema.Choice(
-	            title=u"Selection",
-	            source=PathSourceBinder(portal_type='Document')))
+        friends = schema.List(
+            title=u"Friend objects",
+            description=u"Select as many as you want",
+            value_type=schema.Choice(
+                title=u"Selection",
+                source=PathSourceBinder(portal_type='Document')))
 
 
-	class TestAdapter(object):
-	    implements(ITestForm)
-	    adapts(Interface)
+    class TestAdapter(object):
+        implements(ITestForm)
+        adapts(Interface)
 
-	    def __init__(self, context):
-	        self.context = context
+        def __init__(self, context):
+            self.context = context
 
-	    def _get_buddy(self):
-	        return None
-	    def _set_buddy(self, value):
-	        print "setting", value
-	    buddy = property(_get_buddy, _set_buddy)
+        def _get_buddy(self):
+            return None
+        def _set_buddy(self, value):
+            print "setting", value
+        buddy = property(_get_buddy, _set_buddy)
 
-	    def _get_friends(self):
-	        return []
-	    def _set_friends(self, value):
-	        print "setting", value
-	    friends = property(_get_friends, _set_friends)
+        def _get_friends(self):
+            return []
+        def _set_friends(self, value):
+            print "setting", value
+        friends = property(_get_friends, _set_friends)
 
 
-	class TestForm(form.Form):
-	    fields = field.Fields(ITestForm)
-	    fields['buddy'].widgetFactory = ContentTreeFieldWidget
-	    fields['friends'].widgetFactory = MultiContentTreeFieldWidget
-	    # To check display mode still works, uncomment this and hit refresh.
-	    #mode = 'display'
+    class TestForm(form.Form):
+        fields = field.Fields(ITestForm)
+        fields['buddy'].widgetFactory = ContentTreeFieldWidget
+        fields['friends'].widgetFactory = MultiContentTreeFieldWidget
+        # To check display mode still works, uncomment this and hit refresh.
+        #mode = 'display'
 
-	    @button.buttonAndHandler(u'Ok')
-	    def handle_ok(self, action):
-	        data, errors = self.extractData()
-	        print data, errors
+        @button.buttonAndHandler(u'Ok')
+        def handle_ok(self, action):
+            data, errors = self.extractData()
+            print data, errors
 
-	TestView = layout.wrap_form(TestForm)
+    TestView = layout.wrap_form(TestForm)