"Animation Events" disappear after project reload

I add function(s) to certain places of Animation (namely, attack) using "Add Event" button, but they disappear after I restart Unity3d or reload project. Is this a bug or I missed something? (I use the last version of unity3d)

 

Oh, I found the solution:
https://www.reddit.com/r/Unity3D/comments/3ekyil/bugsanimation_event_automatically_disappear_from/
The problem is that the animation you assigned to your character is Read Only, so you can not assign event to it (weird). To solve it, you choose the animation in your Project view, the animation clip only, Duplicate it (CTRL + D), and then, you are freely to assign any event to it.

Thanks to j3lackfire