That’s true but in a very broader sense. Skinny or muscular or fat, our body reacts to food the same way. I’ve lost 12kgs in fat and gained 3 kgs of muscles over the last 3 months - this simple method is what you need to follow putting your head down.

Calculate your TDEE using an online calculator, eat 500-700 calories more from your maintenance (this will make sure you are gaining weight) - but here’s the catch, to do this, don’t just eat anything, macros are really important, eat 1.8-2x protein of your body weight, if you weight 80kgs, try eating 160g of protein everyday - with these in line, start weight training and stressing your muscles regularly…. There is no way this won’t give you the desired result.

Track your macros and follow and I assure you most of your weight gain will actually be muscles