diff --git a/agendas/2018-09-20.md b/agendas/2018-09-20.md
index 744319d8..b585ac03 100644
--- a/agendas/2018-09-20.md
+++ b/agendas/2018-09-20.md
@@ -17,6 +17,7 @@ Name                 | Organization  | Location
 -------------------- | ------------- | ----------------------
 Lee Byron            | Robinhood     | Menlo Park, CA
 Michael Staib        | ChilliCream   | Zurich, Switzerland
+Matt Mahoney         | Facebook      | New York, NY
 
 <small>\*: willing to take notes (eg. <em>Joe Montana*</em>)</small>
 
@@ -26,6 +27,7 @@ Michael Staib        | ChilliCream   | Zurich, Switzerland
 1. Introduction of attendees
 1. Review agenda (5m)
 1. Determine volunteers for note taking (5m)
+1. Discussion of [Variable Definition Directives](https://github.com/facebook/graphql/pull/510) (5m)
 
 ## Agenda and Attendee guidelines