adding note on building images
@@ -8,6 +8,8 @@ described in
Run test with e2e tag and optionally select conformance test
+> NOTE: Make sure you have built the [test images](https://github.com/knative/eventing/tree/master/test#building-the-test-images)!
+
```go
go test -v -tags=e2e -count=1 ./test/conformance/...
