Add impl. note
Add impl. note

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1416287 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: c6ab92363e0b1003fb2a252461980c11a104e84b
apache/jmeter,benbenw/jmeter,benbenw/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,apache/jmeter,benbenw/jmeter,ham1/jmeter,etnetera/jmeter,ham1/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,ham1/jmeter