diff --git a/AUTHORS b/AUTHORS
index 32a450943..328f7a91b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -30,6 +30,7 @@ their spare time, unpaid, for the love of pinball!
  * Avery Tummons
  * James Cardona
  * Dave Ensminger <dave@ensadi.com>
+ * Charles Duncan (nullbuilds)
 
 MPF is inspired by pyprocgame and skeletongame which were written by:
 
diff --git a/mpf/config_spec.yaml b/mpf/config_spec.yaml
index b5a6009fe..ae435617a 100644
--- a/mpf/config_spec.yaml
+++ b/mpf/config_spec.yaml
@@ -548,6 +548,9 @@ effects:
         size: single|float|4.0
     invert_colors:
         none: ignore
+    linear_gradient:
+        color_stops: dict|float:kivycolor|None
+        angle: single|float|0.0
     monochrome:
         luminosity: list|float|.299, .587, .114
     pixelate: