I made an object and animated it with a hook. Afterwards, I added some vertices to the object that are therefore not attached to the hook. Is there a way to add those vertices to the already existing hook so they will follow its path through the animation? I am using Blender 2.79 on Windows 10.
Keep in mind, that if your hook object is animated, you need to place it in rest/initial position before attaching new vertices (for example switch to frame, where hook is located originaly). Otherwise they could behave incorrectly.
Once did it, enter Edit mode (TAB) and Hook modifier will provide additional options. Select button will show vertices that are already used for hooking. With those selected you should just select new vertices and click Assign. Done.