diff --git a/UNITTESTS/README.md b/UNITTESTS/README.md
index e1e124e80ec..ea9b9e1049b 100644
--- a/UNITTESTS/README.md
+++ b/UNITTESTS/README.md
@@ -10,6 +10,7 @@ This document describes how to run and write unit tests for Mbed OS.
 * CMake 3.0+ installed.
 * Python 2.7.x or >3.5 and pip 10.0 (or newer) installed.
 * gcovr >=4.1
+* mbed-cli >= 1.80
 
 ### Installing dependencies on Debian/Ubuntu