diff --git a/documents/building-linux.md b/documents/building-linux.md
index 0fa22ebf..9645d8b4 100644
--- a/documents/building-linux.md
+++ b/documents/building-linux.md
@@ -46,7 +46,7 @@ cd build/
 
 Use make to build the project:
 ```
-cmake --build . --parallel
+cmake --build . --parallel$(nproc)
 ```
 
 Now run the emulator: