diff --git a/CHANGES.rst b/CHANGES.rst
index d6160af..9c5654b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@ Changelog
 1.0 (unreleased)
 ----------------
 
-- Declare dependency on z3c.relationfield.
+- Declare dependencies on z3c.relationfield and plone.formwidget.contenttree.
 
 - Remove ploneform-render-widget view for content provider, this is now
   in plone.app.z3cform since 0.7.3.
diff --git a/setup.py b/setup.py
index 93481dc..44bed3c 100644
--- a/setup.py
+++ b/setup.py
@@ -44,6 +44,7 @@ setup(
     install_requires=[
         'five.grok',
         'setuptools',
+        'plone.formwidget.contenttree',
         'plone.formwidget.autocomplete',
         'z3c.relationfield',
     ],