diff --git a/packages/jest-runner/src/index.ts b/packages/jest-runner/src/index.ts
index cd297c3696c5..5f6e17eeb615 100644
--- a/packages/jest-runner/src/index.ts
+++ b/packages/jest-runner/src/index.ts
@@ -273,7 +273,8 @@ export default class TestRunner {
           chalk.yellow(
             'A worker process has failed to exit gracefully and has been force exited. ' +
               'This is likely caused by tests leaking due to improper teardown. ' +
-              'Try running with --detectOpenHandles to find leaks.',
+              'Try running with --detectOpenHandles to find leaks. ' +
+              'Active timers can also cause this, ensure that .unref() was called on them.',
           ),
         );
       }