diff --git a/src/applications/differential/storage/DifferentialTransactionComment.php b/src/applications/differential/storage/DifferentialTransactionComment.php
--- a/src/applications/differential/storage/DifferentialTransactionComment.php
+++ b/src/applications/differential/storage/DifferentialTransactionComment.php
@@ -144,4 +144,16 @@
     return $this;
   }
 
+
+  public function isEmptyComment() {
+    if (!parent::isEmptyComment()) {
+      return false;
+    }
+
+    return $this->newInlineCommentObject()
+      ->getContentState()
+      ->isEmptyContentState();
+  }
+
+
 }
diff --git a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
--- a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
+++ b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
@@ -127,15 +127,12 @@
   }
 
   public function hasComment() {
-    if (!$this->getComment()) {
+    $comment = $this->getComment();
+    if (!$comment) {
       return false;
     }
 
-    $content = $this->getComment()->getContent();
-
-    // If the content is empty or consists of only whitespace, don't count
-    // this as comment.
-    if (!strlen(trim($content))) {
+    if ($comment->isEmptyComment()) {
       return false;
     }
 
diff --git a/src/applications/transactions/storage/PhabricatorApplicationTransactionComment.php b/src/applications/transactions/storage/PhabricatorApplicationTransactionComment.php
--- a/src/applications/transactions/storage/PhabricatorApplicationTransactionComment.php
+++ b/src/applications/transactions/storage/PhabricatorApplicationTransactionComment.php
@@ -107,6 +107,18 @@
       $this->getTransactionPHID());
   }
 
+  public function isEmptyComment() {
+    $content = $this->getContent();
+
+    // The comment is empty if there's no content, or if the content only has
+    // whitespace.
+    if (!strlen(trim($content))) {
+      return true;
+    }
+
+    return false;
+  }
+
 /* -(  PhabricatorMarkupInterface  )----------------------------------------- */