diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 82876790e..bfcfd72ca 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -16,8 +16,8 @@ limitations under the License.
 <!-- BEGIN_INCLUDE(manifest) -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.google.fpl.zooshi"
-          android:versionCode="16"
-          android:versionName="1.1">
+          android:versionCode="17"
+          android:versionName="1.1.1">
 
   <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
   <permission
diff --git a/docs/src/doxyfile b/docs/src/doxyfile
index 9f13c0136..88f8a1f90 100644
--- a/docs/src/doxyfile
+++ b/docs/src/doxyfile
@@ -753,6 +753,7 @@ INPUT                  = "index.md" \
                          "programmers_guide/cardboard.md" \
                          "programmers_guide/cardboard_gameplay.md" \
                          "programmers_guide/controllers.md" \
+                         "programmers_guide/firebase.md" \
                          "programmers_guide/gameplay.md" \
                          "programmers_guide/game_states.md" \
                          "programmers_guide/overview.md" \
diff --git a/docs/src/doxygen_layout.xml b/docs/src/doxygen_layout.xml
index a2340798c..4f5bc3768 100644
--- a/docs/src/doxygen_layout.xml
+++ b/docs/src/doxygen_layout.xml
@@ -41,6 +41,7 @@
         <tab type="user" url="@ref zooshi_guide_controllers"
              title="Controllers"/>
         <tab type="user" url="@ref zooshi_guide_cardboard" title="Cardboard"/>
+        <tab type="user" url="@ref zooshi_guide_firebase" title="Firebase"/>
       </tab>
     </tab>
     <tab type="user" url="@ref zooshi_readme" title="Readme"/>
diff --git a/docs/src/firebase.md b/docs/src/firebase.md
new file mode 100644
index 000000000..944bcfa64
--- /dev/null
+++ b/docs/src/firebase.md
@@ -0,0 +1,58 @@
+Firebase {#zooshi_guide_firebase}
+===================
+
+#  Introduction {#firebase_introduction}
+
+This document outlines how the [Firebase C++ SDK][] is used in
+[Zooshi][]. For additional samples on how to integrate Firebase, be sure
+to check out [Firebase Samples][].
+
+# Overview {#firebase_overview}
+
+Firebase makes it easy to add backend services and analytics to your mobile
+games on iOS and Android. With the Firebase C++ SDK, you can access Firebase
+services directly in your C++ code, without having to write any Java or
+Swift (or Objective-C) code.
+
+# AdMob {#firebase_admob}
+
+[Firebase AdMob][] is used to offer [Rewarded Video][] ads to the user,
+in exchange for bonus XP granted upon playing the level. The relevant code can
+be found in (admob.h/.cpp).
+
+# Analytics {#firebase_analytics}
+
+[Firebase Analytics][] is used to collect analytics from various events, such
+as when a level is started, or when a patron is fed. The relevant code can
+be found in (analytics.h/.cpp).
+
+# Cloud Messaging {#firebase_messaging}
+
+[Firebase Cloud Messaging][] is used to deliver messages to users, which can
+call users into playing, and can include rewards. The relevant code can be
+found in (messaging.h/.cpp).
+
+# Invites {#firebase_invites}
+
+[Firebase Invites][] lets users invite others to try Zooshi with app referals
+via email, which gets rewarded with unlockables. The relevant code can be found
+in (invites.h/.cpp).
+
+# Remote Config {#firebase_remote_config}
+
+[Firebase Remote Config][] is used to allow modification of menu items within
+Zooshi without needing to push new versions, through the Firebase console.
+The relevant code can be found in (remote_config.h/.cpp).
+
+<br>
+
+  [Zooshi]: @ref zooshi_index
+  [Firebase C++ SDK]: https://firebase.google.com/docs/cpp/setup
+  [Firebase Samples]: https://firebase.google.com/docs/samples
+  [Firebase AdMob]: https://firebase.google.com/docs/admob/cpp/quick-start
+  [Rewarded Video]: https://firebase.google.com/docs/admob/cpp/rewarded-video
+  [Firebase Analytics]: https://firebase.google.com/docs/analytics/cpp/start
+  [Firebase Cloud Messaging]: https://firebase.google.com/docs/cloud-messaging/cpp/client
+  [Firebase Invites]: https://firebase.google.com/docs/invites/cpp
+  [Firebase Remote Config]: https://firebase.google.com/docs/remote-config/use-config-cpp
+