diff --git a/pages/incubation.map.md b/pages/incubation.map.md
index 259858c..19a38e1 100644
--- a/pages/incubation.map.md
+++ b/pages/incubation.map.md
@@ -13,6 +13,7 @@
 
 -----------
 - [[fulldocs.twitter.booksasmaps]]
+	- https://old.reddit.com/r/slatestarcodex/comments/mvs0vf/what_books_are_for_a_response_to_why_books_dont/
 - [[fulldocs.mastodon.gis]]
 
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