updated changelog

com.unity.shadergraph/CHANGELOG.md

 
 This adds gradient functionality via two new nodes. The Sample Gradient node samples a gradient given a Time parameter. You can define this gradient on the Gradient slot control view. The Gradient Asset node defines a gradient that can be sampled by multiple Sample Gradient nodes using different Time parameters.
 
+### Sphere Mask Node
+
+![](.data/sphereMask.png)
+
+With this node, you can create a sphere mask. Indicate the starting coordinate and center point, and the sphere mask will use these with the Radius and Hardness parameters. Sphere mask functionality works in both 2D and 3D spaces, and is based on the vector coordinates in the Coords and Center input.
 
 ### Show generated code