Update ECMASCRIPT_2017 comment to make it clear there are other features.
@@ -3015,7 +3015,7 @@ public class CompilerOptions implements Serializable {
*/
ECMASCRIPT_2016,
- /** ECMAScript standard approved in 2017. Adds async/await. */
+ /** ECMAScript standard approved in 2017. Adds async/await and other syntax */
ECMASCRIPT_2017,
/** ECMAScript latest draft standard. */
