diff --git a/docs/testing.md b/docs/testing.md
index 4104823..b178fcd 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -1,5 +1,9 @@
 # Running toot tests
 
+toot has a series of integration tests to make sure it works with different Mastodon-compatible servers. This makes it a bit harder to run tests because we need a local instance to run the tests agains.
+
+**Please, never run tests against a live instance!**
+
 ## Mastodon
 
 Clone mastodon repo and check out the tag you want to test: