diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -57,8 +57,11 @@
 
 When installing your knsrc configuration file, you should install it into the location
 where KNewStuffCore expects it to be found. Do this by using the CMake variable
-KDE_INSTALL_KNSRCDIR as provided by the KNewStuffCore module. You can also handle this
-yourself, which means you will need to feed Engine::init() the full path to the knsrc file.
+`KDE_INSTALL_KNSRCDIR` as provided by the KNewStuffCore module, since 5.57.0.
+To support older versions you can use the CMake variable `KDE_INSTALL_CONFDIR` from
+[Extra-CMake-Modules' KDEInstallDirs](https://api.kde.org/ecm/kde-module/KDEInstallDirs.html).
+You can also handle this yourself, which means you will need to feed `Engine::init()`
+the full path to the knsrc file.
 
 ## Which module should you use?