Right at the end of the red mark on the yellow side of it, not a deep hinge but a overly weak spot. Adjust your gizmo pencil down to 1/8" to the limb at that spot and give it a sweep up and down the limb, it will be an eye opener. After you check the left limb use the same setting to sweep the right, the gizmo will mark a good bit of the right limb because it is a bit stiffer.
Set you gizmo at the same draw length you took the picture at.
Here is an old artists trick, to see detail that may have escaped you, squint your eyes and look again, squinty eyes catch detail better for some reason.