diff --git a/README.md b/README.md
index 6153006a32..0cede9d065 100644
--- a/README.md
+++ b/README.md
@@ -820,6 +820,8 @@ Please go to the [architecture](doc/architecture.md) doc.
 
 Run the tests with `sbt test`, or for continuous development, `sbt ~test`.  Noisy cassandra logs can be seen in `filodb-test.log`.
 
+To run one individual test run a command like this one `sbt sparkJobs/testOnly filodb.downsampler.DownsamplerMainSpec`.
+
 The docs use [mermaid](https://github.com/knsv/mermaid) and [doctoc](https://github.com/thlorenz/doctoc).  On a Mac, to install:
 
     brew install yarn