diff --git a/docs/guides/known-issues.md b/docs/guides/known-issues.md
index 510e6d1b..48bcb32f 100644
--- a/docs/guides/known-issues.md
+++ b/docs/guides/known-issues.md
@@ -1,10 +1,18 @@
 # Known issues
 
-## Missing modules and Views
+## Safari flexbox performance
 
-This is an initial release of React Native for Web, therefore, not all of the
-views present on iOS/Android are released on Web. We are very much interested in
-the community's feedback on the next set of modules and views.
+Safari version prior to 10.1 can suffer from extremely [poor flexbox
+performance](https://bugs.webkit.org/show_bug.cgi?id=150445). The recommended
+way to work around this issue (as used on mobile.twitter.com) is to set
+`display:block` on Views in your element hierarchy that you know don't need
+flexbox layout.
+
+## Missing modules and components
+
+Not all of the views present on iOS/Android are currently available on Web. We
+are very much interested in the community's feedback on the next set of modules
+and views.
 
 Not all the modules or views for iOS/Android can be implemented on Web. In some
 cases it will be necessary to use a Web counterpart or to guard the use of a