diff --git a/doc/index.rst b/doc/index.rst
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--- a/doc/index.rst
+++ b/doc/index.rst
@@ -15,6 +15,7 @@ Contents:
 
    api
    presentation
+   ui-mockups/index
 
 Indices and tables
 ==================
diff --git a/doc/ui-mockups/index.rst b/doc/ui-mockups/index.rst
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+++ b/doc/ui-mockups/index.rst
@@ -0,0 +1,15 @@
+UI mockups and design
+=====================
+
+We are planning significant changes to the graphical user interface of
+Monkeysign in the 2.x branch.
+
+Signing interface
+-----------------
+
+ .. image:: sign-ui-mockup.png
+
+Key sharing interface
+---------------------
+
+ .. image:: share-ui-mockup.png
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