diff --git a/README.md b/README.md
index 47d13ad..6a21df1 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,11 @@ Currently managed systems:
 
 ## Deployment
 
+Create garbage collection roots like so:
+```
+colmena build --keep-result
+```
+
 - **sue**: `colmena apply-local --sudo --impure`
 - **gamepc**: `colmena apply --on gamepc --impure`