diff --git a/test_generators/README.md b/test_generators/README.md
index 743157aae..66534e5a8 100644
--- a/test_generators/README.md
+++ b/test_generators/README.md
@@ -28,9 +28,12 @@ make clean
 This runs all the generators.
 
 ```bash
-make gen_yaml_tests
+make -j 4 gen_yaml_tests
 ```
 
+The `-j N` flag makes the generators run in parallel, with `N` being the amount of cores.
+
+
 ### Running a single generator
 
 The make file auto-detects generators in the `test_generators/` directory,