[JENKINS-34755] Noting since for #2337.

core/src/main/java/jenkins/util/SystemProperties.java

@@ -63,7 +63,7 @@ import org.kohsuke.accmod.restrictions.NoExternalUse;
  * because {@link EnvVars} is only for build variables, not Jenkins itself variables.
  *
  * @author Johannes Ernst
- * @since TODO
+ * @since 2.4
  */
 //TODO: Define a correct design of this engine later. Should be accessible in libs (remoting, stapler) and Jenkins modules too
 @Restricted(NoExternalUse.class)