diff --git a/docs/pages/release_notes.md b/docs/pages/release_notes.md
index c907a22cfd..a645aed087 100644
--- a/docs/pages/release_notes.md
+++ b/docs/pages/release_notes.md
@@ -14,6 +14,24 @@ This is a {{ site.pmd.release_type }} release.
 
 ### New and noteworthy
 
+#### Performance improvements for XPath 2.0 rules
+
+XPath rules written with XPath 2.0 now support conversion to a rulechain rule, which
+improves their performance. The rulechain is a mechanism that allows several rules
+to be executed in a single tree traversal. Conversion to the rulechain is possible if
+your XPath expression looks like `//someNode/... | //someOtherNode/...  | ...`, that
+is, a union of one or more path expressions that start with `//`. Instead of traversing
+the whole tree once per path expression (and per rule), a single traversal executes all
+rules in your ruleset as needed.
+
+This conversion is performed automatically and cannot be disabled. *The conversion should
+not change the result of your rules*, if it does, please report a bug at https://github.com/pmd/pmd/issues
+
+Note that XPath 1.0 support, the default XPath version, is deprecated since PMD 6.22.0.
+**We highly recommend that you upgrade your rules to XPath 2.0**. Please refer to the [migration guide](https://pmd.github.io/latest/pmd_userdocs_extending_writing_xpath_rules.html#migrating-from-10-to-20).
+
+
+
 ### Fixed Issues
 
 ### API Changes