diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0659533..b521f1d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,8 @@
 cmake_minimum_required(VERSION 3.13)
 
+# Can also be changed by upper CMakeLists.txt file
+find_library(LIB_FSFW_NAME fsfw REQUIRED)
+
 option(FSFW_HAL_ADD_LINUX "Add the Linux HAL to the sources. Required gpiod library" OFF)
 option(FSFW_HAL_ADD_RASPBERRY_PI "Add Raspberry Pi specific code to the sources" OFF)
 
@@ -15,6 +18,7 @@ if(NOT LIB_FSFW_NAME)
     message(ERROR "LIB_FSFW_NAME needs to be set as a linkable target")
 endif()
 
+
 add_subdirectory(common)
 
 if(FSFW_HAL_ADD_LINUX)
diff --git a/README.md b/README.md
index 3e972ed..8c78f5d 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,17 @@ FSFW Hardware Abstraction Layer
 
 This repository contains hardware abstraction components for 
 common hardware like `Raspberry Pi`s or the STM32H743ZIT6 board.
+
+# Prerequisites
+
+This library needs to be linked against the [Flight Software Framework](https://egit.irs.uni-stuttgart.de/fsfw/fsfw.git). Make sure that the library `fsfw` was added and linked against in your main application.
+
+# Configuring the library with CMake options
+
+There is a set of options available to compile the HAL.
+These should be set by the upper level CMakeLists.txt, with 
+`set(<Option> ON)`.
+
+1. `FSFW_HAL_ADD_LINUX`: Add linux HAL. Required `gpiod` library.
+2. `FSFW_HAL_ADD_RASPBERRY_PI`: Add Raspberry Pi specific components.
+3. `FSFW_HAL_ADD_STM32H7`: Add STM32H7 specific components.