diff --git a/docs/TESTS.md b/docs/TESTS.md
index f099a5443..8087150fd 100644
--- a/docs/TESTS.md
+++ b/docs/TESTS.md
@@ -129,6 +129,7 @@ Documentation:
   in the same order they were defined in
 * `--stale` - runs only tests which reference modules that changed since the last
   time tests were ran with `--stale`
+* `--only task_id:1` - or with another number, on learning exercises runs only the tests associated with the specific task
 
 Documentation: