diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index a8d8769..b609643 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -600,8 +600,9 @@
 ----
 
 As a response, two link:#change-info[ChangeInfo] entities are returned
-that describe information added and removed from the `old` change state.
-Only fields that differ between the change's two states are returned.
+that describe information added and removed from the `old` change state, and
+the two link:#change-info[ChangeInfo] entities that generated the diff are
+returned. Only fields that differ between the change's two states are returned.
 
 .Response
 ----
@@ -625,9 +626,55 @@
       "topic": "new-topic"
     },
     "removed": {
-      "updated": "2013-02-20 12:05:34.111000000",
+      "updated": "2013-02-01 09:59:32.126000000",
       "topic": "old-topic"
-    }
+    },
+    "old_change_info": {
+      "id": "myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "project": "myProject",
+      "branch": "master",
+      "attention_set": [],
+      "change_id": "I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "subject": "Implementing Feature X",
+      "status": "NEW",
+      "topic": "old-topic",
+      "created": "2013-02-01 09:59:32.126000000",
+      "updated": "2013-02-01 09:59:32.126000000",
+      "mergeable": true,
+      "insertions": 34,
+      "deletions": 101,
+      "_number": 3965,
+      "owner": {
+        "name": "John Doe"
+      }
+    },
+    "new_change_info": {
+      "id": "myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "project": "myProject",
+      "branch": "master",
+      "attention_set": [
+        {
+          "account": {
+            "name": "John Doe"
+          },
+         "last_update": "2013-02-21 11:16:36.775000000",
+         "reason": "reviewer or cc replied"
+        }
+      ],
+      "change_id": "I8473b95934b5732ac55d26311a706c9c2bde9940",
+      "subject": "Implementing Feature X",
+      "status": "NEW",
+      "topic": "new-topic",
+      "created": "2013-02-01 09:59:32.126000000",
+      "updated": "2013-02-21 11:16:36.775000000",
+      "mergeable": true,
+      "insertions": 34,
+      "deletions": 101,
+      "_number": 3965,
+      "owner": {
+        "name": "John Doe"
+      }
+    },
   }
 ----
 
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java b/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
index ba5e323..ad112d3 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfoDiffer.java
@@ -63,9 +63,12 @@
    */
   public static ChangeInfoDifference getDifference(
       ChangeInfo oldChangeInfo, ChangeInfo newChangeInfo) {
-    return ChangeInfoDifference.create(
-        /* added= */ getAdded(oldChangeInfo, newChangeInfo),
-        /* removed= */ getAdded(newChangeInfo, oldChangeInfo));
+    return ChangeInfoDifference.builder()
+        .setOldChangeInfo(oldChangeInfo)
+        .setNewChangeInfo(newChangeInfo)
+        .setAdded(getAdded(oldChangeInfo, newChangeInfo))
+        .setRemoved(getAdded(newChangeInfo, oldChangeInfo))
+        .build();
   }
 
   @SuppressWarnings("unchecked") // reflection is used to construct instances of T
diff --git a/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java b/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
index 269c673..997c3ee 100644
--- a/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
+++ b/java/com/google/gerrit/extensions/common/ChangeInfoDifference.java
@@ -20,11 +20,29 @@
 @AutoValue
 public abstract class ChangeInfoDifference {
 
+  public abstract ChangeInfo oldChangeInfo();
+
+  public abstract ChangeInfo newChangeInfo();
+
   public abstract ChangeInfo added();
 
   public abstract ChangeInfo removed();
 
-  public static ChangeInfoDifference create(ChangeInfo added, ChangeInfo removed) {
-    return new AutoValue_ChangeInfoDifference(added, removed);
+  public static Builder builder() {
+    return new AutoValue_ChangeInfoDifference.Builder();
+  }
+
+  @AutoValue.Builder
+  public abstract static class Builder {
+
+    public abstract Builder setOldChangeInfo(ChangeInfo oldChangeInfo);
+
+    public abstract Builder setNewChangeInfo(ChangeInfo newChangeInfo);
+
+    public abstract Builder setAdded(ChangeInfo added);
+
+    public abstract Builder setRemoved(ChangeInfo removed);
+
+    public abstract ChangeInfoDifference build();
   }
 }
diff --git a/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java b/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
index 4352fe8..024e35e 100644
--- a/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
+++ b/javatests/com/google/gerrit/extensions/common/ChangeInfoDifferTest.java
@@ -58,6 +58,17 @@
   }
 
   @Test
+  public void getDiff_returnsOldAndNewChangeInfos() {
+    ChangeInfo oldChangeInfo = createChangeInfoWithTopic("topic");
+    ChangeInfo newChangeInfo = createChangeInfoWithTopic(oldChangeInfo.topic);
+
+    ChangeInfoDifference diff = ChangeInfoDiffer.getDifference(oldChangeInfo, newChangeInfo);
+
+    assertThat(diff.oldChangeInfo()).isEqualTo(oldChangeInfo);
+    assertThat(diff.newChangeInfo()).isEqualTo(newChangeInfo);
+  }
+
+  @Test
   public void getDiff_givenUnchangedTopic_returnsNullTopics() {
     ChangeInfo oldChangeInfo = createChangeInfoWithTopic("topic");
     ChangeInfo newChangeInfo = createChangeInfoWithTopic(oldChangeInfo.topic);