diff --git a/Inc/stm32f7xx_hal_conf.h b/Inc/stm32f7xx_hal_conf.h
index 671c900..998b296 100644
--- a/Inc/stm32f7xx_hal_conf.h
+++ b/Inc/stm32f7xx_hal_conf.h
@@ -95,7 +95,7 @@
   *        (when HSE is used as system clock source, directly or through the PLL).  
   */
 #if !defined  (HSE_VALUE) 
-  #define HSE_VALUE    4000000U /*!< Value of the External oscillator in Hz */
+  #define HSE_VALUE    8000000U /*!< Value of the External oscillator in Hz */
 #endif /* HSE_VALUE */
 
 #if !defined  (HSE_STARTUP_TIMEOUT)
diff --git a/README.md b/README.md
index 4a020a0..e8fed8a 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 > **This is a [flexPTP](https://github.com/epagris/flexPTP) demo project showcasing the capabilities of the flexPTP [IEEE 1588 Precision Time Protocol](https://ieeexplore.ieee.org/document/9120376) implementation for the [STMicroelectronics NUCLEO-F746ZG](https://www.st.com/en/evaluation-tools/nucleo-f746zg.html) devboard.**
 
-Still not clear what is it useful for? No worries, it's a behind-the-scenes support technology that use unaware every day if you have a smartphone or when you are connected to the internet. Modern telecommunication and measurement systems often rely on precise time synchronization down to the nanoseconds' scale. Methods got standardized by the IEEE and now it's known by the name of the Precision Time Protocol. This software project is an evaluation environment to showcase the capabilities of our IEEE 1588 PTP implementation named `flexPTP` on the STMicroelectronics NUCLEO-F746ZG board.
+Still not clear what is it useful for? No worries, it's a behind-the-scenes support technology that you use unaware every day if you have a smartphone or when you are connected to the internet. Modern telecommunication and measurement systems often rely on precise time synchronization down to the nanoseconds' scale. Methods got standardized by the IEEE and now it's known by the name of the Precision Time Protocol. This software project is an evaluation environment to showcase the capabilities of our IEEE 1588 PTP implementation named `flexPTP` on the STMicroelectronics NUCLEO-F746ZG board.
 
 > [!TIP]
 >**Just want to try the demo and skip compiling? Download one of the precompiled binaries and jump to [Deploying](#deploying)!**
@@ -80,6 +80,10 @@ The firmware prints its messages to and expect user input coming on the board co
 
 The 1PPS signal is emitted on the `PB5` pin.
 
+## Test environment
+
+To test the software and evaluate the synchronization accuracy connect the devboard with another PTP-compatible equipment, either a dedicated Master clock or any other device (e.g. another devboard). We recommend using the [linuxptp](https://github.com/richardcochran/linuxptp) software suite available in Linux systems through the official package repositories, PTP hardware support is available out-of-the-box on several Intel NICs, like Intel I210, Intel I219-V or Intel 82576.
+
 ## Development
 
 An all-around [Visual Studio Code](https://code.visualstudio.com/) project is packaged along the project to enable easy development, debugging and editing. To enable these powerful features, install the [STM32Cube for Visual Studio Code](https://marketplace.visualstudio.com/items?itemName=stmicroelectronics.stm32-vscode-extension), [CMakeTools](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cmake-tools), [Cortex-Debug](https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug), [Embedded Tools](https://marketplace.visualstudio.com/items?itemName=ms-vscode.vscode-embedded-tools) extensions, [OpenOCD](https://openocd.org/) and the [STM32CubeCLT](https://www.st.com/en/development-tools/stm32cubeclt.html) software package. The latter one is required for downloading the firmware right away using the Cortex-Debug extension (if not done through OpenOCD) and for providing the Embedded Tools extension with register description `.SVD` files. [clangd](https://marketplace.visualstudio.com/items?itemName=llvm-vs-code-extensions.vscode-clangd) and clang-format are highly recommended.