--- a/doc/design.txt	Wed May 13 13:01:08 2020 -0400
+++ b/doc/design.txt	Thu May 14 22:18:18 2020 -0400
@@ -911,6 +911,11 @@
         return hyperdb.Link(name)
 
 
+.. index:: schema; detectors design
+   single: detectors; design of
+   single: pair: detectors; auditors
+   single: pair: detectors; reactors
+
 Detector Interface
 ------------------
 
@@ -936,6 +941,13 @@
 *reactors* that have been registered for the operation.
 
 
+.. index:: detectors; interface specification
+   single: detectors; register
+   single: auditors; class registration method
+   single: reactors; class registration method
+   pair: class methods; audit
+   pair: class methods; react
+
 Detector Interface Specification
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~