diff --git a/README.md b/README.md
index dee2e36..883ea58 100644
--- a/README.md
+++ b/README.md
@@ -5,15 +5,14 @@ This is the project for SystemAgent compatible SBCs.
 ## How to build the same image
 
 * Clone buildroot repository.
-* Set `BUILDROOT_PATH` environment variable accordingly.
-* Run `buildroot_make.sh xxxx_defconfig` (see `configs`).
+* Run `buildroot_make.sh xxxx_defconfig` (see `external_tree/configs`).
 * Run `buildroot_make.sh nconfig` to make your changes.
 * Run `buildroot_make.sh` to start your runs.
 
 ## Necessary modifications
 ### Add new users
-Edit users.table in `customizations` directory.
+Edit users.table in `external_tree/customizations` directory.
 
 ### Copy whatever you want into the filesystem
-Add them to the `customizations/overlay` directory, if the directory does not exist, create it.
+Add them to the `external_tree/customizations/overlay` directory, if the directory does not exist, create it.