diff --git a/CHANGES.md b/CHANGES.md
index 8179a3a63e1d..d609abbb87ba 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@ Change Log
 
 * Fixed a bug that caused non-base imagery layers with a limited `rectangle` to be stretched to the edges of imagery tiles. [#416](https://github.com/AnalyticalGraphicsInc/cesium/issues/416)
 * Fixed rendering polylines with duplicate positions. [#898](https://github.com/AnalyticalGraphicsInc/cesium/issues/898)
+* Worked around a shader compilation regression in Firefox 33 and 34 by falling back to a less precise shader on those browsers. [#2197](https://github.com/AnalyticalGraphicsInc/cesium/issues/2197)
 * Added support to the `CesiumTerrainProvider` for handling terrain tiles that define more than 64k vertices.
 * Added `Primitive.compressVertices`. When true, the geometry vertices are compressed, which will save memory.
 * Upgraded topojson from 1.6.8 to 1.6.18.