diff --git a/src/main/java/com/criteo/gerrit/plugins/automerge/ReviewUpdater.java b/src/main/java/com/criteo/gerrit/plugins/automerge/ReviewUpdater.java
new file mode 100644
index 0000000..f04fc26
--- /dev/null
+++ b/src/main/java/com/criteo/gerrit/plugins/automerge/ReviewUpdater.java
@@ -0,0 +1,79 @@
+package com.criteo.gerrit.plugins.automerge;
+
+import com.google.gerrit.extensions.api.changes.ReviewInput;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.account.AccountByEmailCache;
+import com.google.gerrit.server.change.ChangesCollection;
+import com.google.gerrit.server.change.PostReview;
+import com.google.gerrit.server.change.RevisionResource;
+import com.google.gerrit.server.project.ChangeControl;
+import com.google.gerrit.server.project.NoSuchChangeException;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+
+import java.io.IOException;
+import java.util.Set;
+
+public class ReviewUpdater {
+  @Inject
+  private AccountByEmailCache byEmailCache;
+
+  @Inject
+  ChangeData.Factory changeDataFactory;
+
+  @Inject
+  private ChangeControl.GenericFactory changeFactory;
+
+  @Inject
+  private ChangesCollection collection;
+
+  final AutomergeConfig config;
+  @Inject
+  Provider<ReviewDb> db;
+
+  @Inject
+  private IdentifiedUser.GenericFactory factory;
+
+  @Inject
+  Provider<PostReview> reviewer;
+
+  public ReviewUpdater(final AutomergeConfig config) {
+    this.config = config;
+  }
+
+  public void commentOnReview(final int number, final String comment) throws NoSuchChangeException, OrmException,
+      AuthException, BadRequestException, UnprocessableEntityException, IOException {
+    final ReviewInput message = new ReviewInput();
+    message.message = comment;
+    final Set<Account.Id> ids = byEmailCache.get(config.getBotEmail());
+    final IdentifiedUser bot = factory.create(ids.iterator().next());
+    final ChangeControl ctl = changeFactory.controlFor(new Change.Id(number), bot);
+    final ChangeData changeData = changeDataFactory.create(db.get(), new Change.Id(number));
+
+    final RevisionResource r = new RevisionResource(collection.parse(ctl), changeData.currentPatchSet());
+    reviewer.get().apply(r, message);
+  }
+
+  public void setMinusTwo(final int number, final String comment) throws NoSuchChangeException, OrmException,
+      AuthException, BadRequestException, UnprocessableEntityException, IOException {
+    final ReviewInput message = new ReviewInput();
+    message.message = comment;
+    message.label("Code-Review", -2);
+    final Set<Account.Id> ids = byEmailCache.get(config.getBotEmail());
+    final IdentifiedUser qabot = factory.create(ids.iterator().next());
+    final ChangeControl ctl = changeFactory.controlFor(new Change.Id(number), qabot);
+    final ChangeData changeData = changeDataFactory.create(db.get(), new Change.Id(number));
+
+    final RevisionResource r = new RevisionResource(collection.parse(ctl), changeData.currentPatchSet());
+    reviewer.get().apply(r, message);
+  }
+
+}