diff --git a/SC2236.md b/SC2236.md
index e72bbc7..7522288 100644
--- a/SC2236.md
+++ b/SC2236.md
@@ -34,4 +34,5 @@ This is a stylistic issue that does not affect correctness. If you prefer the or
 
 ### 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!
+* [Bash reference manual for -z and -n](https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html#Bash-Conditional-Expressions).
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