diff --git a/SoftwareAddon.md b/SoftwareAddon.md
index cabbd28..b21f923 100644
--- a/SoftwareAddon.md
+++ b/SoftwareAddon.md
@@ -10,6 +10,9 @@ that interact with BOINC components:
 * [Web RPCs](WebRpc): These interfaces let a program or web site obtain information about projects, and create/edit entities (users, teams, hosts) on projects.
 * [Local editing of preferences](PrefsOverride): This mechanism lets you write programs for local editing of preferences.
 * APIs for [remote job submission](RemoteJobs), [management of input files](RemoteInputFiles), and [fetching output files](RemoteOutputFiles).
+* [CrossProjectUserId](Cross-project user identification)
+* [Keywords](DesignKeywords)
+* [Specialized download pages](DownloadInfo)
 
 Check [the index of add-on software](https://boinc.berkeley.edu/addons.php) before writing anything (it may already exist).
 The index has instructions for submitting new add-ons.