diff --git a/Go2ErrorValuesFeedback.md b/Go2ErrorValuesFeedback.md
index f9f42db..b105dd5 100644
--- a/Go2ErrorValuesFeedback.md
+++ b/Go2ErrorValuesFeedback.md
@@ -8,6 +8,7 @@
 
 ### Error Inspection
 
+ - Greg Weber, “[Horizontal composition: Error inspection for groups](https://gist.github.com/gregwebs/5a14a83970d607411310a3e0281d55be)”, September 2018
  - K. Alex mills, "[Rename Wrapper to Unwrapper](https://gist.github.com/kalexmills/46c2cb276c69b659005d8705180b268a)", September 2018
  - jimmy frasche, "[Why limit this inspection to errors?](https://gist.github.com/jimmyfrasche/04ca2146c9130dab4d993365313722fb)", August 2018
  - Dan Kortschak, [Carrying contract expectations and values causing errors in ev3go](https://github.com/ev3go/ev3dev/blob/master/errors.go), August 2018