Fixes #20498: Warn about flexbox bugs in our flex grid docs

diff --git a/docs/layout/flexbox-grid.md b/docs/layout/flexbox-grid.md
index 80db93c934c9370daf3404bce81fc15e374079f6..4f456e273a5d11d32925d212630ecfe2917eec72 100644 (file)
--- a/docs/layout/flexbox-grid.md
+++ b/docs/layout/flexbox-grid.md
@@ -27,6 +27,7 @@ The flexbox grid system behaves similar to our default grid system, but with a f
 - Flexbox grid columns without a set width will automatically layout with equal widths. For example, four columns will each automatically be 25% wide.
 - Flexbox grid columns have significantly more alignment options available, including vertical alignment.
 - Unlike the default grid system where a grid column starts as full-width in the `xs` tier, flexbox requires a `.col-{breakpoint}` class for each tier.
+- Be aware of the limitations and [bugs around flexbox](https://github.com/philipwalton/flexbugs), like the [inability to use some HTML elements as flex containers](https://github.com/philipwalton/flexbugs#9-some-html-elements-cant-be-flex-containers). 
 
 Chill? Awesome—keep reading for more information and some code snippets.