diff --git a/README.md b/README.md
index ad1e79f..fbee3f5 100644
--- a/README.md
+++ b/README.md
@@ -591,25 +591,25 @@
 Devices can be configured to create additional `vbmeta` partitions as
 [chained partitions](#The-VBMeta-struct) in order to update a subset of
 partitions without changing the top-level `vbmeta` partition. For example,
-the following variables create `vbmeta_mainline.img` as a chained `vbmeta`
+the following variables create `vbmeta_system.img` as a chained `vbmeta`
 image that contains the hash-tree descriptors for `system.img` and
-`product_services.img`. `vbmeta_mainline.img` itself will be signed by the
+`product_services.img`. `vbmeta_system.img` itself will be signed by the
 specified key and algorithm.
 
-    BOARD_AVB_VBMETA_MAINLINE := system product_services
-    BOARD_AVB_VBMETA_MAINLINE_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
-    BOARD_AVB_VBMETA_MAINLINE_ALGORITHM := SHA256_RSA2048
-    BOARD_AVB_VBMETA_MAINLINE_ROLLBACK_INDEX_LOCATION := 1
+    BOARD_AVB_VBMETA_SYSTEM := system product_services
+    BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
+    BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA2048
+    BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX_LOCATION := 1
 
 Note that the hash-tree descriptors for `system.img` and
-`product_services.img` will be included only in `vbmeta_mainline.img`, but
+`product_services.img` will be included only in `vbmeta_system.img`, but
 not `vbmeta.img`. With the above setup, partitions `system.img`,
-`product_services.img` and `vbmeta_mainline.img` can be updated
+`product_services.img` and `vbmeta_system.img` can be updated
 independently - but as a group - of the rest of the partitions, *or* as
 part of the traditional updates that update all the partitions.
 
 Currently build system supports building chained `vbmeta` images of
-`vbmeta_mainline.img` (`BOARD_AVB_VBMETA_MAINLINE`) and `vbmeta_vendor.img`
+`vbmeta_system.img` (`BOARD_AVB_VBMETA_SYSTEM`) and `vbmeta_vendor.img`
 (`BOARD_AVB_VBMETA_VENDOR`).
 
 To prevent rollback attacks, the rollback index should be increased on