diff --git a/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp b/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
index e91d4984f..4e107ca9a 100644
--- a/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
@@ -10,7 +10,7 @@
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03
 
-// FLAKY_TEST
+// FLAKY_TEST.
 
 // <future>
 
diff --git a/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp b/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
index 6b6220293..0a5a3e419 100644
--- a/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
+// FLAKY_TEST.
 
 // <thread>