How to include javadoc into a decompiled code?

I'm using IntelliJ IDEA Community edition and i previously used to read decompiled source code with javadoc simply by clicking CTRL + ClassName or methodName or so.

But i have messed up with some settings which i don't remember and therefore can't find it again and now decompiled classes just show me the code with no javadoc.

Please help, how do i get everything back?