diff --git a/kde-modules/KDEInstallDirs.cmake b/kde-modules/KDEInstallDirs.cmake
--- a/kde-modules/KDEInstallDirs.cmake
+++ b/kde-modules/KDEInstallDirs.cmake
@@ -128,6 +128,8 @@
 #     [``CONFIG_INSTALL_DIR``]
 # ``AUTOSTARTDIR``
 #     autostart files (``CONFDIR/autostart``) [``AUTOSTART_INSTALL_DIR``]
+# ``DEBUGCATEGORIESDIR``
+#     kdebugsettings categories files directory (``DATAROOTDIR/debug-categories5``) Since 5.59.0
 #
 # If ``KDE_INSTALL_USE_QT_SYS_PATHS`` is set to TRUE before including this
 # module, the default values for some variables are instead queried from
@@ -579,9 +581,10 @@
     KNOTIFYRC_INSTALL_DIR)
 _define_relative(KXMLGUI5DIR DATAROOTDIR "kxmlgui5"
     "kxmlgui .rc files"
-    KXMLGUI_INSTALL_DIR)
 _define_relative(KTEMPLATESDIR DATAROOTDIR "kdevappwizard/templates"
     "Kapptemplate and Kdevelop templates")
+_define_relative(DEBUGCATEGORIESDIR DATAROOTDIR "debug-categories5"
+    "Kdebugsettings categories files")
 
 # Cross-desktop or other system things
 _define_relative(ICONDIR DATAROOTDIR "icons"