How to make a "shine" on image

Hey, im pretty much between novice and adept in CS, and i was wondering...how would i make a shine like this:



(image taken from user DEWCHUGR, sorry its the best example i got)

Look closely at the pic, it has a shine above the 2 yellow circles...how could i create this? Would i need to use the feather maybe? PLEASE HELP

Here's one tutorial:
http://www.tutorialized.com/tutorial/Aqua-Style-Button-with-Photoshop/7455

Here's a good Google search:
http://www.google.com/search?client=opera&rls=en&q=shining+buttons+tutorial+photoshop&sourceid=opera&ie=utf-8&oe=utf-8

• make a shape
  
• assign gradient of white-trasnparent
  
• adjust opacity / blending modes until desiered effect is acheived.