Update index.md (#3957)

gatsbyjs · Feb 10, 2018 · 429a6ed · 429a6ed
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diff --git a/examples/using-remark/src/pages/2018-01-27---custom-components/index.md b/examples/using-remark/src/pages/2018-01-27---custom-components/index.md
@@ -13,6 +13,8 @@ What if you want custom UI interactions embedded in your Markdown?
 
 By using `rehype-react` with the `htmlAst` field, you can write custom React components and then reference them from your Markdown files.
 
+*Note: this functionality was added in version 1.7.31 of gatsby-transformer-remark*
+
 ## Writing a component
 
 Write the component the way you normally would. For example, here's a simple "Counter" component: