diff --git a/README.md b/README.md
index 0a98315000e0f42e32fee5c88dff317164fdce43..e0a45ff96d2a4f215c110044018a762714d1fc5b 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,15 @@ Inside of your Redox build system, run:
 make prefix
 ```
 
-(It only works if the timestamp of the `relibc` folder changed)
+If you need to rebuild `relibc` for testing a cookbook recipe, run:
+
+```sh
+touch relibc && make prefix r.recipe-name
+```
+
+Touching `relibc` is needed to trigger recompilation for `make prefix`. Replace `recipe-name` with your desired recipe name.
+
+Note: Do not edit `relibc` inside `prefix` folder! Do your work on `relibc` folder directly inside your Redox build system instead.
 
 ### Issues