diff --git a/README.md b/README.md
index 1f99d956..322ffa6c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 ![u-blox logo](/readme_images/ublox-logo.png)
 
+![important message](/readme_images/important_msg.svg)
+
 # Introduction to `ubxlib`
 This repository contains the C code support library for [u-blox](https://www.u-blox.com) modules with [cellular](https://www.u-blox.com/en/cellular-modules) (2G/3G/4G), [short-range](https://www.u-blox.com/en/short-range-radio-chips-and-modules) (Bluetooth and Wi-Fi) and [positioning](https://www.u-blox.com/en/positioning-chips-and-modules) (GNSS) support. The library presents high level C APIs for use in customer applications (e.g. connect to a network, open a TCP socket, establish location, etc.) and implements these APIs on selected popular MCUs, also available inside u-blox modules.
 
diff --git a/port/platform/stm32cube/mcu/stm32f4/runner/README.md b/port/platform/stm32cube/mcu/stm32f4/runner/README.md
index ba91d3c9..f3981e9f 100644
--- a/port/platform/stm32cube/mcu/stm32f4/runner/README.md
+++ b/port/platform/stm32cube/mcu/stm32f4/runner/README.md
@@ -1,4 +1,6 @@
 # Introduction
+> ⚠️ **IMPORTANT NOTE:** The STM32CubeIDE project will soon be replaced with a Makefile.
+
 This directory contains a build which compiles and runs any or all of the examples and tests for the STM32F4 MCU under the STM32Cube IDE.
 
 IMPORTANT: the STM32Cube IDE creates lots of sub-directories in here.  Please ignore them, NONE of the source files/header files are down here, they are all up in the `app` sub-directory for this platform so that they can be built with other/future ST SDKs as required.  Don't delete the empty directories though: if you do the STM32Cube IDE will then delete the links to the files in the `.project` file.
diff --git a/readme_images/important_msg.svg b/readme_images/important_msg.svg
new file mode 100755
index 00000000..38f6990a
--- /dev/null
+++ b/readme_images/important_msg.svg
@@ -0,0 +1,33 @@
+<svg fill="none" viewBox="0 0 800 100" width="800" height="100" xmlns="http://www.w3.org/2000/svg">
+    <foreignObject width="100%" height="100%">
+        <div xmlns="http://www.w3.org/1999/xhtml">
+            <style>
+                .notification {
+                    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";
+                    background-color: #fff8c4;
+                    border: 1px solid #f2c779;
+                    border-radius: 10px;
+                    padding: 10px 10px 10px 36px;
+                }
+                .header {
+                    font-weight:bold;
+                    font-size: 20px;
+                }
+                .icon {
+                    font-size: 20px;
+                }
+                .message {
+                    padding: 10px 0px 0px 0px;
+                }
+            </style>
+            <div class="notification">
+                <div>
+                    <span class="icon">⚠️ </span><span class="header">Important Note:</span>
+                </div>
+                <div class="message">
+                    The test runner STM32CubeIDE project will soon be removed and replaced with a Makefile
+                </div>
+            </div>
+        </div>
+    </foreignObject>
+</svg>
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