diff --git a/SC2080.md b/SC2080.md
index 7e5a16b..9f5f498 100644
--- a/SC2080.md
+++ b/SC2080.md
@@ -27,4 +27,6 @@ None
 
 ### Related resources:
 
-* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
+
+[The BASH manual "Shell Arithmetic" chapter](https://www.gnu.org/software/bash/manual/html_node/Shell-Arithmetic.html)
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