Documentation minor change

Author: Iason Nikolas

README_building.md

@@ -101,7 +101,7 @@ A list with all the supported presets for your system can be inspected by the fo
 
 Given that list you can configure, build and test the project with the following commands.
 
-    cmake --preset=<config-preset-name>
+    cmake -S . --preset=<config-preset-name>
     cmake --build --preset=<build-preset-name>
 	ctest --build --preset=<test-preset-name>