diff --git a/docs/installation.rst b/docs/installation.rst
index 3c55b7b..1b98bd6 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -57,6 +57,9 @@ Dependencies
 These are the top-level packages that are needed by the webapp and why. They
 rely propably on other packages as well.
 
+deform
+    form rendering and validation library
+
 passlib[argon2, bcrypt]
     password hashing library with argon2 and bcrypt support
 
diff --git a/setup.py b/setup.py
index 456669f..655c2ab 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,7 @@ with open('HISTORY.rst') as history_file:
     history = history_file.read()
 
 requirements = [
+    'deform',
     'passlib[argon2, bcrypt]',
     'pyramid',
     'pyramid_jinja2',