diff --git a/doc/HACKING b/doc/HACKING
index 92001be94e..182b0bac8c 100644
--- a/doc/HACKING
+++ b/doc/HACKING
@@ -20,6 +20,11 @@ test executable. For features at a higher level, tests in src/test/ are very
 strongly recommended. If that is no possible, integration tests in test/ are
 encouraged.
 
+Please also have a look at our list of code quality tools we have setup for systemd,
+to ensure our codebase stays in good shape:
+
+        https://github.com/systemd/systemd/blob/master/doc/CODE_QUALITY.md
+
 Please always test your work before submitting a PR. For many of the components
 of systemd testing is straight-forward as you can simply compile systemd and
 run the relevant tool from the build directory.