diff --git a/SC2223.md b/SC2223.md
index e6ceb0f..d30fa25 100644
--- a/SC2223.md
+++ b/SC2223.md
@@ -19,6 +19,12 @@ If `COLUMNS='/*/*/*/*/*/*'`, the unquoted, problematic code may spend 30+ minute
 
 The correct code uses double quotes to avoid glob expansion, and therefore does not have this problem.
 
+When quoting, make sure to update any inner quotes:
+
+    : ${var:='foo'}    # Assigns foo without quotes
+    : "${var:='foo'}"  # Assigns 'foo' with quotes
+
+
 ### Exceptions:
 
 None, though this issue is largely theoretical.
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