diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
index 203a59b..0b6abe6 100644
--- a/LayoutTests/ChangeLog
+++ b/LayoutTests/ChangeLog
@@ -1,3 +1,14 @@
+2019-05-16  Youenn Fablet  <youenn@apple.com>
+
+        Layout Test http/wpt/cache-storage/cache-quota-add.any.html is a flaky failure
+        https://bugs.webkit.org/show_bug.cgi?id=197952
+        <rdar://problem/50859168>
+
+        Unreviewed.
+
+        * platform/ios-simulator-wk2/TestExpectations:
+        Mark test as slow as per flakiness dashboard.
+
 2019-05-16  Daniel Bates  <dabates@apple.com>
 
         [iOS] Unable to commit search on MSN.com, qq.com, or sina.com.cn using enter key (hardware or software keyboard)
diff --git a/LayoutTests/platform/ios-simulator-wk2/TestExpectations b/LayoutTests/platform/ios-simulator-wk2/TestExpectations
index 71a94b9..22fda6c 100644
--- a/LayoutTests/platform/ios-simulator-wk2/TestExpectations
+++ b/LayoutTests/platform/ios-simulator-wk2/TestExpectations
@@ -82,6 +82,7 @@
 http/wpt/cache-storage/cache-quota.any.html [ Slow ]
 http/wpt/cache-storage/cache-put-keys.https.any.worker.html [ Slow ]
 http/wpt/cache-storage/a-cache-open.https.html [ Slow ]
+http/wpt/cache-storage/cache-quota-add.any.html [ Slow ]
 
 webkit.org/b/196376 [ Debug ] storage/domstorage/localstorage/private-browsing-affects-storage.html [ Pass Failure ]