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diff --git a/crawl-ref/docs/level_design.txt b/crawl-ref/docs/level_design.txt
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+++ b/crawl-ref/docs/level_design.txt
@@ -1316,6 +1316,11 @@ dump to be different than the default you can give one_way_stair a
You can dynamically change the origin string using the lua function
dgn.set_level_type_origin().
+Known portal vault entries will be displayed on the overmap. By default
+the name shown on the overmap will be the "dstname" parameter, or if
+that isn't present the "dst" paremeter. It can be set to something else
+with the "dstovermap" parameter.
+
This will produce a portal, but attempting to use it will trigger an
ASSERT since there's no map for the destination. So we create a
destination map like so: