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+## Braces are required when expanding arrays, as in ${array[idx]}.
+
+### Problematic code:
+
+    echo "$array[@]"
+
+### Correct code:
+
+    echo "${array[@]}"
+
+### Rationale:
+
+For compatibility reasons, `$foo[bar]` is interpreted as the variable `$foo` followed by the literal string `[bar]`.
+
+Curly braces are needed to tell the shell that the square brackets are part of the expansion.
+
+### Contraindications
+
+If you want the square brackets to be treated literally or as a glob, you can use `${var}[idx]` to prevent this warning.
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