diff --git a/README.md b/README.md
index eea403a1..312bc077 100644
--- a/README.md
+++ b/README.md
@@ -91,9 +91,11 @@ You can use the following commands inside the `fsfw` folder to set up the build
 
 ```sh
 mkdir build-Unittest && cd build-Unittest
-cmake -DFSFW_BUILD_UNITTESTS=ON ..
+cmake -DFSFW_BUILD_UNITTESTS=ON -DFSFW_OSAL=host ..
 ```
 
+You can also use `-DFSFW_OSAL=linux` on Linux systems.
+
 Coverage data in HTML format can be generated using the `CodeCoverage`
 [CMake module](https://github.com/bilke/cmake-modules/tree/master).
 To build the unittests, run them and then generare the coverage data in this format,