diff --git a/specifications/xpath-functions-40/src/function-catalog.xml b/specifications/xpath-functions-40/src/function-catalog.xml
index 58a79a2f3..23b431e12 100644
--- a/specifications/xpath-functions-40/src/function-catalog.xml
+++ b/specifications/xpath-functions-40/src/function-catalog.xml
@@ -27600,7 +27600,7 @@ declare function some(
          the <emph>authority</emph> is empty and the <emph>string</emph> is
          the first match group.</p></item>
          <item><p>Otherwise, if the <emph>string</emph>
-         matches <code>^///*([^/]+)(/.*)?$</code>, the <emph>authority</emph>
+         matches <code>^///*([^/]+)?(/.*)?$</code>, the <emph>authority</emph>
          is the first match group and the <emph>string</emph> is the second
          match group.</p></item>
          <item><p>Finally, if the <emph>string</emph> does not match either