In Xcode 5, you can make your comments appear in the Xcode opt-click pop-up help by using 3 slashes (///) instead of 2.

Example, you'd normally write:

//This comment has 2 slashes
- (void)logout;

Instead, you write:

///This comment has 3 slashes
- (void)logout;

This is especially helpful if you judiciously document your header files.

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