added pull request number

h2/src/docsrc/html/changelog.html

@@ -21,7 +21,7 @@ Change Log
 
 <h2>Next Version (unreleased)</h2>
 <ul>
-<li>Add functions ARRAY_CAT(), ARRAY_APPEND() and ARRAY_SLICE()
+<li>PR #1648: Add functions ARRAY_CAT(), ARRAY_APPEND() and ARRAY_SLICE()
 </li>
 <li>PR #1638: Add support for Java 11 to test suite
 </li>