diff --git a/core/config.mk b/core/config.mk
index e43793a..43cc4e8 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -75,6 +75,7 @@
   ANDROID_EMULATOR_PREBUILTS \
   ANDROID_PRE_BUILD_PATHS \
   ,See $(CHANGES_URL)#other_envsetup_variables)
+$(KATI_obsolete_var PRODUCT_COMPATIBILITY_MATRIX_LEVEL_OVERRIDE,Set FCM Version in device manifest instead. See $(CHANGES_URL)#PRODUCT_COMPATIBILITY_MATRIX_LEVEL_OVERRIDE)
 
 CHANGES_URL :=