diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Added a new `colorPalette` service for retrieving and generating color arrays for use in charts ([#1209](https://github.com/elastic/eui/pull/1209))
 - Added `1` as a valid value for the `columns` prop in `EuiFlexGrid` ([#1210](https://github.com/elastic/eui/pull/1210))
+- Make `htmlIdGenerator` only return valid HTML4 ids ([#637](https://github.com/elastic/eui/pull/637))
 
 ## [`4.2.0`](https://github.com/elastic/eui/tree/v4.2.0)