How do I attach(add) javadoc or source code in Eclipse ?

Problem statement: How do I add javadoc or source code in eclipse?
step-1: go to Window -> Preferences -> Java -> Installed JREs 
step-2: edit jre1.8.0 -> expand rt.jar -> click source attachment 
step-3: click external location -> External File -> go to C:\Program Files\Java\jdk1.8.0_91
step-4: select src.zip -> click ok -> click finish -> click ok