diff --git a/docs/source/whatsnew/0.8.4.txt b/docs/source/whatsnew/0.8.4.txt
index fb053b13..1938ca2a 100644
--- a/docs/source/whatsnew/0.8.4.txt
+++ b/docs/source/whatsnew/0.8.4.txt
@@ -67,3 +67,4 @@ Miscellaneous
 * Adds :func:`~zipline.utils.test_utils.subtest` decorator for creating subtests
   without ``nose_parameterized.expand`` which bloats the test output
   (:issue:`833`).
+* Limits timer report in test output to 15 longest tests (:issue:`838`).