diff --git a/src/core/org/apache/jmeter/util/HostNameSetter.java b/src/core/org/apache/jmeter/util/HostNameSetter.java
index 0672f96..33fea7a 100644
--- a/src/core/org/apache/jmeter/util/HostNameSetter.java
+++ b/src/core/org/apache/jmeter/util/HostNameSetter.java
@@ -11,6 +11,7 @@
  * Uses the underlying implementation to support Server Name Indication (SNI).
  * @author Michael Locher <cmbntr@gmail.com>
  * @see <a href="https://issues.apache.org/jira/browse/HTTPCLIENT-1119">HTTPCLIENT-1119</a>
+ * @since 3.1 (extracted from JMeterClientConnectionOperator.java)
  */
 public class HostNameSetter {