diff --git a/SC2229.md b/SC2229.md
index 7df1da7..bd0adfd 100644
--- a/SC2229.md
+++ b/SC2229.md
@@ -36,4 +36,8 @@ read "${foo}"    # ShellCheck warns
 read "${foo?}"   # No warning
 ```
 
-`${foo?}` fails when `foo` is unset, which is fine since `read` would have failed too. The main side effect is an improved runtime error message in that case.
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+`${foo?}` fails when `foo` is unset, which is fine since `read` would have failed too. The main side effect is an improved runtime error message in that case.
+
+### Related resources:
+
+* [Bash Pitfalls #12](https://mywiki.wooledge.org/BashPitfalls#pf12): `read $foo`
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