# Add notes in the equation under brace [duplicate]

This question already has an answer here:

How to write the equation shown in the image

## marked as duplicate by user13907, Przemysław Scherwentke, Jesse, Heiko Oberdiek, Claudio FiandrinoAug 22 '15 at 10:30

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## 1 Answer

You could use \overbrace and \underbrace:

\documentclass{article}

\usepackage{amsmath}

\begin{document}

$$\overbrace{a}^{\text{output}} = \underbrace{b}_{\text{significant}} + \underbrace{c + d}_{\text{non significant}}$$

\end{document}