Add link to the Gerit multi-site talk

Change-Id: I072d2efb1eb595ba58919f4af6b5df1cc3468122
diff --git a/schedule-usa.md b/schedule-usa.md
index 811cf2f..63e31a8 100644
--- a/schedule-usa.md
+++ b/schedule-usa.md
@@ -24,7 +24,7 @@
 |  9:30 | What's new in Gerrit v3.0                                                                    |
 | 10:30 | Break & Networking                                                                           |
 | 10:45 | [First-class Gerrit CI integration with Checks](sessions/first-class-ci-integration.md)      |
-| 11:45 | Gerrit goes multi-site                                                                       |
+| 11:45 | [Gerrit goes multi-site](sessions/gerrit-multi-site.md)                                      |
 | 12:45 | Lunch & Networking                                                                           |
 | 14:00 | [JGit (concrete topic to be decided)](sessions/jgit.md)
 | 15:00 | [Gerrit upgrades, step-by-step](sessions/gerrit-upgrades-step-by-step.md)                    |