From 9cfa9fdb2964a11b58151b22dff9cbb2e920e9d6 Mon Sep 17 00:00:00 2001
From: Stavros Ntentos <133706+stdedos@users.noreply.github.com>
Date: Mon, 1 Feb 2021 14:46:53 +0200
Subject: [PATCH] Updated SC2154 (markdown)

---
 SC2154.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/SC2154.md b/SC2154.md
index e2e6993..4492210 100644
--- a/SC2154.md
+++ b/SC2154.md
@@ -53,3 +53,11 @@ Note: This message only triggers for variables with lowercase characters in thei
 ShellCheck intentionally does not attempt to figure out runtime or dynamic assignments like with `source "$(date +%F).sh"` or `eval var=value`. See [[SC2034]] for an extended discussion of why this is the case.
 
 If you know for a fact that the variable is set, you can use `${var:?}` to fail if the variable is unset (or empty), initialize it to a default value if uninitialized with `: "${var:=}"`, or explicitly initialize/declare it with `var=""` or `declare var`. You can also disable the message with a [[directive]].
+
+---
+
+## Read more:
+
+POSIX - Parameter expansion:
+* https://stackoverflow.com/a/16753536/2309247
+* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02
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