diff --git a/README.md b/README.md
index b123202e..f602993b 100644
--- a/README.md
+++ b/README.md
@@ -22,12 +22,20 @@ First, configure the variant you'd like to build in `mkosi.local.conf`. For a
 desktop system, you'll want the `desktop` and one of `gnome`, `kde`, or
 `sway` profiles.
 
+```conf
+[Config]
+Profiles=desktop,kde
+```
+
+When building for a different distribution than the one you are currently running,
+you must also specify the distribution and include the required tools:
+
 ```conf
 [Distribution]
 Distribution=arch
 
-[Config]
-Profiles=desktop,kde
+[Build]
+ToolsTreeProfiles=package-manager
 ```
 
 It is also strongly recommended to write a hashed root password prefixed with