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diff --git a/tools/vm/README.md b/tools/vm/README.md
index 898c95fca..1e9859e66 100644
--- a/tools/vm/README.md
+++ b/tools/vm/README.md
@@ -25,6 +25,12 @@ vm_image(
These images can be built manually by executing the target. The output on
`stdout` will be the image id (in the current project).
+For example:
+
+```
+$ bazel build :ubuntu
+```
+
Images are always named per the hash of all the hermetic input scripts. This
allows images to be memoized quickly and easily.