diff --git a/src/repository/api/base/ArcanistRepositoryAPI.php b/src/repository/api/base/ArcanistRepositoryAPI.php
index 1acdd39f..1a987707 100644
--- a/src/repository/api/base/ArcanistRepositoryAPI.php
+++ b/src/repository/api/base/ArcanistRepositoryAPI.php
@@ -157,5 +157,6 @@ abstract class ArcanistRepositoryAPI {
   abstract public function getRawDiffText($path);
   abstract public function getOriginalFileData($path);
   abstract public function getCurrentFileData($path);
+  abstract public function getLocalCommitInformation();
 
 }
diff --git a/src/repository/api/git/ArcanistGitAPI.php b/src/repository/api/git/ArcanistGitAPI.php
index 520aad78..17181d76 100644
--- a/src/repository/api/git/ArcanistGitAPI.php
+++ b/src/repository/api/git/ArcanistGitAPI.php
@@ -46,6 +46,35 @@ class ArcanistGitAPI extends ArcanistRepositoryAPI {
     return $this;
   }
 
+  public function getLocalCommitInformation() {
+    list($info) = execx(
+      '(cd %s && git log %s..%s --format=%s --)',
+      $this->getPath(),
+      $this->getRelativeCommit(),
+      'HEAD',
+      '%H%x00%T%x00%P%x00%at%x00%an%x00%s');
+
+    $commits = array();
+
+    $info = trim($info);
+    $info = explode("\n", $info);
+    foreach ($info as $line) {
+      list($commit, $tree, $parents, $time, $author, $title)
+        = explode("\0", $line, 6);
+
+      $commits[] = array(
+        'commit'  => $commit,
+        'tree'    => $tree,
+        'parents' => array_filter(explode(' ', $parents)),
+        'time'    => $time,
+        'author'  => $author,
+        'summary' => $title,
+      );
+    }
+
+    return $commits;
+  }
+
   public function getRelativeCommit() {
     if ($this->relativeCommit === null) {
       list($err) = exec_manual(
diff --git a/src/repository/api/mercurial/ArcanistMercurialAPI.php b/src/repository/api/mercurial/ArcanistMercurialAPI.php
index 0571cced..d9de1a1b 100644
--- a/src/repository/api/mercurial/ArcanistMercurialAPI.php
+++ b/src/repository/api/mercurial/ArcanistMercurialAPI.php
@@ -82,6 +82,16 @@ class ArcanistMercurialAPI extends ArcanistRepositoryAPI {
     return $this->relativeCommit;
   }
 
+  public function getLocalCommitInformation() {
+    list($info) = execx(
+      '(cd %s && hg log --rev %s..%s --)',
+      $this->getPath(),
+      $this->getRelativeCommit(),
+      'tip');
+    return $this->parseMercurialLog($info);
+  }
+
+
   public function getBlame($path) {
     list($stdout) = execx(
       '(cd %s && hg blame -u -v -c --rev %s -- %s)',
@@ -284,6 +294,16 @@ class ArcanistMercurialAPI extends ArcanistRepositoryAPI {
             $commit['local'] = $local;
             $commit['rev'] = $rev;
             break;
+          case 'parent':
+            if (empty($commit['parents'])) {
+              $commit['parents'] = array();
+            }
+            list($local, $rev) = explode(':', $value, 2);
+            $commit['parents'][] = array(
+              'local' => $local,
+              'rev'   => $rev,
+            );
+            break;
           default:
             throw new Exception("Unknown Mercurial log field '{$name}'!");
         }
diff --git a/src/repository/api/subversion/ArcanistSubversionAPI.php b/src/repository/api/subversion/ArcanistSubversionAPI.php
index 9a6941e2..4616ed35 100644
--- a/src/repository/api/subversion/ArcanistSubversionAPI.php
+++ b/src/repository/api/subversion/ArcanistSubversionAPI.php
@@ -478,4 +478,8 @@ EODIFF;
     return $info['Repository UUID'];
   }
 
+  public function getLocalCommitInformation() {
+    return null;
+  }
+
 }
diff --git a/src/workflow/diff/ArcanistDiffWorkflow.php b/src/workflow/diff/ArcanistDiffWorkflow.php
index 0a8c4cde..8fa93390 100644
--- a/src/workflow/diff/ArcanistDiffWorkflow.php
+++ b/src/workflow/diff/ArcanistDiffWorkflow.php
@@ -339,6 +339,17 @@ EOTEXT
         ));
     }
 
+    $local_info = $repository_api->getLocalCommitInformation();
+    if ($local_info) {
+      $conduit->callMethodSynchronous(
+        'differential.setdiffproperty',
+        array(
+          'diff_id' => $diff_info['diffid'],
+          'name'    => 'local:commits',
+          'data'    => json_encode($local_info),
+        ));
+    }
+
     if ($this->unresolvedTests) {
       $data = array();
       foreach ($this->unresolvedTests as $test) {