Update README.md

Author: lizwar

README.md

@@ -9,7 +9,7 @@ An introduction to DSP fundamentals using low-cost, high-performance Arm Cortex-
 ## About this Book
 The Arm Digital Signal Processing (DSP) textbook introduces readers to DSP fundamentals using low-cost, high-performance Arm Cortex-M based microcontrollers as demonstrator platforms. To help readers understand DSP, it covers foundational concepts, principles and techniques, such as signals and systems, sampling, reconstruction and anti-aliasing, FIR and IIR filter design, transforms, and adaptive signal processing. Key features for those learning DSP include a set of hands-on labs that highlight the practical side, end-of-chapter exercises that reinforce the theoretical concepts presented (with answers available online), and online instructor resources. 
 
-The textbook is suitable for use in Electronic and Computer Engineering (ECE), Electrical Engineering (EE) and Computer Science (CS) university departments. The labs in this textbook edition target the low-cost Arm Cortex M4-based STM32F4 Discovery microcontroller board.
+The textbook is suitable for use in Electronic and Computer Engineering (ECE), Electrical Engineering (EE) and Computer Science (CS) university departments. The labs in this textbook edition target the low-cost Arm Cortex M4-based STM32F4 Discovery microcontroller board. Answers to the lab exercises can be [downloaded here](https://github.com/arm-university/Digital-Signal-Processing-using-Arm-Cortex-M-based-Microcontrollers/blob/main/Exercise%20Answers%20to%20Labs_DSPtextbook.7z).
 
 ## Table of Contents:
 1.	Digital Signal Processing Basics