Add a session on Zoekt.

Change-Id: I8cbf9d4520aacd2313cac49f778f40a421e28f4b
diff --git a/schedule.md b/schedule.md
index 93ccca0..72a7bfb 100644
--- a/schedule.md
+++ b/schedule.md
@@ -51,6 +51,7 @@
 | 11:30 | PolyGerrit UX: Findings from research/experience on the new GUI              |
 | 12:15 | Lunch, Expo & Networking                                                     |
 | 14:00 | [Gerrit CI: keep logs forever](sessions/gerrit-ci-forever.md)                |
+| 14:20 | [improvements to Zoekt code search](sessions/zoekt-improvements.md)          |
 | 14:45 | [Beyond Gerrit](sessions/beyond-gerrit.md)                                   |
 | 15:30 | Break, Expo & Networking                                                     |
 | 16:00 | [What's new in Gerrit 2.15](sessions/new-in-2.15.md)                         |
@@ -74,4 +75,3 @@
 | 14:45 | [Export Review, Projects and Metrics to powerful dashboards](sessions/gerrit-graphs-dashboards.md)  |
 | 15:30 | Break, Expo & Networking                                                                            |
 | 16:00 | Conference wrap-up and Closing Keynote                                                              |
-
diff --git a/sessions/zoekt-improvements.md b/sessions/zoekt-improvements.md
new file mode 100644
index 0000000..0435f25
--- /dev/null
+++ b/sessions/zoekt-improvements.md
@@ -0,0 +1,7 @@
+# improvements to the Zoekt code search system
+
+Since the launch of a public "Zoekt" code search instance at
+https://cs.bazel.build, the search engine system has undergone many
+improvements, most motivated by the problems when running the public instance.
+
+*[Han-Wen Nienhuys, Google](../speakers.md#hanwen)*
diff --git a/speakers.md b/speakers.md
index e4f9647..4592829 100644
--- a/speakers.md
+++ b/speakers.md
@@ -21,6 +21,13 @@
 
 Eryk is leading CollabNet's TeamForge Git Engineering team in Berlin.
 
+### Han-Wen Nienhuys - Google {#hanwen}
+
+[LinkedIn](https://de.linkedin.com/in/han-wen-nienhuys-794735/)
+
+Han-Wen has been managing Google's Gerrit team in Munich, Germany since 2015.
+
+
 ### Jacek Centkowski - CollabNet {#jcentkowski}
 
 [LinkedIn](https://www.linkedin.com/in/jcentkowski/)