Update release notes, refs #1384

docs/pages/release_notes.md

@@ -14,18 +14,26 @@ This is a {{ site.pmd.release_type }} release.
 
 ### New and noteworthy
 
+#### New Rules
+
+*   The new Java rule [`UseUnderscoresInNumericLiterals`](https://pmd.github.io/pmd-6.10.0/pmd_rules_java_codestyle.html#useunderscoresinnumericliterals)
+    (`java-codestyle`) verifies that numeric literals over a given length (4 chars by default, but configurable) are using underscores every 3 digits for readability.
+    The rule only applies to Java 7+ codebases.
+
 ### Fixed Issues
 
 *   all
     *   [#1318](https://github.com/pmd/pmd/issues/1318): \[test] Kotlin DSL to ease test writing
     *   [#1341](https://github.com/pmd/pmd/issues/1341): \[doc] Documentation Error with Regex Properties
 *   java-codestyle
+    *   [#1232](https://github.com/pmd/pmd/issues/1232): \[java] Detector for large numbers not separated by _
     *   [#1372](https://github.com/pmd/pmd/issues/1372): \[java] false positive for UselessQualifiedThis
 
 ### API Changes
 
 ### External Contributions
 
+*   [#1384](https://github.com/pmd/pmd/pull/1384): \[java] New Rule - UseUnderscoresInNumericLiterals - [RajeshR](https://github.com/rajeshggwp)
 *   [#1424](https://github.com/pmd/pmd/pull/1424): \[doc] #1341 Updating Regex Values in default Value Property - [avishvat](https://github.com/vishva007)
 *   [#1428](https://github.com/pmd/pmd/pull/1428): \[core] Upgrading JCommander from 1.48 to 1.72 - [Thunderforge](https://github.com/Thunderforge)
 *   [#1430](https://github.com/pmd/pmd/pull/1430): \[doc] Who really knows regex? - [Dem Pilafian](https://github.com/dpilafian)