Signed Interest Format

Change-Id: Ic52835977cadb34479508c7817f842bd3330961b
Refs: #4599
diff --git a/index.rst b/index.rst
index b6b4df2..e3346ab 100644
--- a/index.rst
+++ b/index.rst
@@ -11,6 +11,7 @@
    data
    signature
    link
+   signed-interest
    types
    changelog
    :maxdepth: 3