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diff --git a/doc/ikiwiki/directive/map/discussion.mdwn b/doc/ikiwiki/directive/map/discussion.mdwn
index 808930fa4..e82b3f71b 100644
--- a/doc/ikiwiki/directive/map/discussion.mdwn
+++ b/doc/ikiwiki/directive/map/discussion.mdwn
@@ -11,3 +11,32 @@ Question: Is there a way to generate a listing that shows *both* title and descr
 Is that possible?
 
 --Peter
+
+----
+
+The site I'm trying to set up right now (not really a wiki - no public editing) is divided into topics.  Topics are pages that have `\[[!meta link="/topic"]]`.  Topic pages contain an index of their subpages (done with `\[[!inline]]`); the subpages are the real content.  I want a map in the sidebar that lists:
+
+ * all of the topics;
+ * all of the first-level subpages of the *current topic only*.
+
+That is, if the current page is "Topic A" or "Topic A/Page 1", then the map should look like
+
+    Topic A
+        Page 1
+        Page 2
+        Page 3
+    Topic B
+    Topic C
+
+but if the current page is "Topic B" or one of its subpages, then the map should look like
+
+    Topic A
+    Topic B
+        Page 1
+        Page 2
+        Page 3
+    Topic C
+
+Is there any way to do that?  I don't mind mucking around with `[[!meta]]` on every page if that's what it takes.
+
+-- Zack