Update CHANGES.md and reference doc.

CesiumGS · Feb 1, 2017 · e884442 · e884442
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diff --git a/CHANGES.md b/CHANGES.md
@@ -1,6 +1,10 @@
 Change Log
 ==========
 
+### 1.31 - 2017-03-01
+
+* Enable rendering `GroundPrimitives` on hardware without the `EXT_frag_depth` extension; however, this could cause artifacts for certain viewing angles.
+
 ### 1.30 - 2017-02-01
 
 * Deprecated

diff --git a/Source/Scene/GroundPrimitive.js b/Source/Scene/GroundPrimitive.js
@@ -84,9 +84,8 @@ define([
      * is supported at this time.
      * </p>
      * <p>
-     * Because of the cutting edge nature of this feature in WebGL, it requires the EXT_frag_depth extension, which is currently only supported in Chrome,
-     * Firefox, Edge, and Safari 10. It's not yet supported in iOS 10. Android support varies by hardware and IE11 will most likely never support
-     * it. You can use webglreport.com to verify support for your hardware.
+     * For correct rendering, this feature requires the EXT_frag_depth WebGL extension. For hardware that do not support this extension, there
+     * will be rendering artifacts for some viewing angles.
      * </p>
      * <p>
      * Valid geometries are {@link CircleGeometry}, {@link CorridorGeometry}, {@link EllipseGeometry}, {@link PolygonGeometry}, and {@link RectangleGeometry}.