diff -r 39b144f9fa54 -r 50b8b06be26d hgext3rd/topic/__init__.py
--- a/hgext3rd/topic/__init__.py	Fri Oct 12 15:03:29 2018 +0200
+++ b/hgext3rd/topic/__init__.py	Fri Oct 12 15:37:22 2018 +0200
@@ -355,6 +355,7 @@
 
     if not post45template:
         templatekw.keywords['topic'] = topickw
+        templatekw.keywords['topicidx'] = topicidxkw
     # Wrap workingctx extra to return the topic name
     extensions.wrapfunction(context.workingctx, '__init__', wrapinit)
     # Wrap changelog.add to drop empty topic