diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewers/Module.java b/src/main/java/com/googlesource/gerrit/plugins/reviewers/Module.java
index 97e21cc..dd3895b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewers/Module.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewers/Module.java
@@ -17,26 +17,48 @@
 import static com.google.gerrit.server.project.ProjectResource.PROJECT_KIND;
 
 import com.google.gerrit.common.EventListener;
+import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.registration.DynamicSet;
 import com.google.gerrit.extensions.restapi.RestApiModule;
 import com.google.gerrit.extensions.webui.TopMenu;
 import com.google.gerrit.server.config.FactoryModule;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import com.google.inject.Inject;
+
+import org.eclipse.jgit.lib.Config;
 
 class Module extends FactoryModule {
+  private final boolean enableUI;
+  private final boolean enableREST;
+
+  @Inject
+  public Module(@PluginName String pluginName,
+      PluginConfigFactory pluginCfgFactory) {
+    Config c = pluginCfgFactory.getGlobalPluginConfig(pluginName);
+    this.enableREST = c.getBoolean("reviewers", null, "enableREST", true);
+    this.enableUI = enableREST
+        ? c.getBoolean("reviewers", null, "enableUI", true)
+        : false;
+  }
+
   @Override
   protected void configure() {
-    DynamicSet.bind(binder(), TopMenu.class).to(
-        ReviewersTopMenu.class);
+    if (enableUI) {
+      DynamicSet.bind(binder(), TopMenu.class).to(
+          ReviewersTopMenu.class);
+    }
     DynamicSet.bind(binder(), EventListener.class).to(
         ChangeEventListener.class);
     factory(DefaultReviewers.Factory.class);
     factory(ReviewersConfig.Factory.class);
-    install(new RestApiModule() {
-      @Override
-      protected void configure() {
-        get(PROJECT_KIND, "reviewers").to(GetReviewers.class);
-        put(PROJECT_KIND, "reviewers").to(PutReviewers.class);
-      }
-    });
+    if (enableREST) {
+      install(new RestApiModule() {
+        @Override
+        protected void configure() {
+          get(PROJECT_KIND, "reviewers").to(GetReviewers.class);
+          put(PROJECT_KIND, "reviewers").to(PutReviewers.class);
+        }
+      });
+    }
   }
 }
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index fe05e25..f592c29 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -1,8 +1,26 @@
 Configuration
 =============
 
-The configuration of the @PLUGIN@ plugin is done on project level in
-the `reviewers.config` file of the project. Missing values are inherited
+Global configuration of the @PLUGIN@ plugin is done in the
+`reviewers.config` file in the site's `etc` directory.
+
+```
+  [reviewers]
+    enableREST = true
+    enableUI = false
+```
+
+reviewers.enableREST
+:	Enable the REST API. When set to false, the REST API is not available.
+	Defaults to true.
+
+reviewers.enableUI
+:	Enable the UI.  When set to false, the 'Reviewers' menu is not displayed
+	on the project screen. Defaults to true, or false when `enableREST` is false.
+
+
+Per project configuration of the @PLUGIN@ plugin is done in the
+`reviewers.config` file of the project. Missing values are inherited
 from the parent projects. This means a global default configuration can
 be done in the `reviewers.config` file of the `All-Projects` root project.
 Other projects can then override the configuration in their own