diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5b98f7381..0f9b2d53a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,8 @@
 ## Build Prerequisites ##
 Have at least a local copy of built redis, for more information see [tutorial](https://www.digitalocean.com/community/tutorials/how-to-install-and-use-redis).
 
+Note that redis shouldn't be running - the build will start instances as needed.
+
 ## Running the tests ##
 
 ``` bash