diff --git a/SC2236.md b/SC2236.md
index 0349b20..8191745 100644
--- a/SC2236.md
+++ b/SC2236.md
@@ -35,4 +35,5 @@ 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!
-* [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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+* [Bash reference manual for -z and -n](https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html#Bash-Conditional-Expressions).
+* Note: Be careful with quoting variables (which you should always do anyway): `[ ! -z $var ]` might work, but `[ -n $var]` will not. `[ -n "$var" ]` will do what you expect.  
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