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@@ -18,6 +18,9 @@ function CalculateCalibrationSum(document: string[]): number {
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*
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* If only one digit is present, the one digit is concatenated to
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* itself.
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+ *
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+ * Uses a lookahead regex group to handle nested words
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+ * @see https://mtsknn.fi/blog/how-to-do-overlapping-matches-with-regular-expressions/#capturing-groups-inside-lookahead-lookbehind-assertions
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*
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* @param {string} line The line of text to extract the calibration value out of
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* @returns {number} The two-digit calibration value hidden in that string
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