diff --git a/nontech/genetics/docs/books.txt b/nontech/genetics/docs/books.txt
index d8489e115..374cead15 100644
--- a/nontech/genetics/docs/books.txt
+++ b/nontech/genetics/docs/books.txt
@@ -1,3 +1,4 @@
 2024
 Brownlee - Genetic Algorithm Afternoon
     https://libgen.gs/edition.php?id=148153121
+    ! so-so, 130p only