diff --git a/extension.json b/extension.json
index 77602d862..d76217c2f 100644
--- a/extension.json
+++ b/extension.json
@@ -63,6 +63,7 @@
 				"ThreadItem.js",
 				"CommentItem.js",
 				"HeadingItem.js",
+				"CommentDetails.js",
 				"lib/moment-timezone/moment-timezone-with-data-1970-2030.js",
 				{
 					"name": "parser/data.json",
diff --git a/modules/CommentController.js b/modules/CommentController.js
index 80dd18309..79103d7f8 100644
--- a/modules/CommentController.js
+++ b/modules/CommentController.js
@@ -1,5 +1,6 @@
 /**
  * @external CommentItem
+ * @external CommentDetails
  * @external ThreadItem
  */
 
@@ -74,7 +75,7 @@ function getLatestRevId( pageName ) {
  * and then follows transclusions to determine the source page where it is written.
  *
  * @param {CommentItem} comment Comment
- * @return {jQuery.Promise} Promise which resolves with pageName+oldId, or rejects with an error
+ * @return {jQuery.Promise} Promise which resolves with a CommentDetails object, or rejects with an error
  */
 CommentController.prototype.getTranscludedFromSource = function ( comment ) {
 	var pageName = mw.config.get( 'wgRelevantPageName' ),
@@ -161,8 +162,8 @@ CommentController.prototype.setup = function ( mode, hideErrors ) {
 	this.$replyLinkButtons.addClass( 'ext-discussiontools-init-replylink-active' );
 
 	if ( !this.replyWidgetPromise ) {
-		this.replyWidgetPromise = this.getTranscludedFromSource( comment ).then( function ( pageData ) {
-			return commentController.createReplyWidget( comment, pageData.pageName, pageData.oldId, { mode: mode } );
+		this.replyWidgetPromise = this.getTranscludedFromSource( comment ).then( function ( commentDetails ) {
+			return commentController.createReplyWidget( comment, commentDetails, { mode: mode } );
 		}, function ( code, data ) {
 			commentController.teardown();
 
@@ -213,10 +214,16 @@ CommentController.prototype.getReplyWidgetClass = function ( visual ) {
 	} );
 };
 
-CommentController.prototype.createReplyWidget = function ( comment, pageName, oldId, config ) {
+/**
+ * @param {CommentItem} comment
+ * @param {CommentDetails} commentDetails
+ * @param {Object} config
+ * @return {jQuery.Promise} Promise resolved with a ReplyWidget
+ */
+CommentController.prototype.createReplyWidget = function ( comment, commentDetails, config ) {
 	var commentController = this;
 	return this.getReplyWidgetClass( config.mode === 'visual' ).then( function ( ReplyWidget ) {
-		return new ReplyWidget( commentController, comment, pageName, oldId, config );
+		return new ReplyWidget( commentController, comment, commentDetails, config );
 	} );
 };
 
@@ -381,8 +388,7 @@ CommentController.prototype.switchToWikitext = function () {
 	var wikitextPromise = target.getWikitextFragment( target.getSurface().getModel().getDocument() );
 	this.replyWidgetPromise = this.createReplyWidget(
 		oldWidget.comment,
-		oldWidget.pageName,
-		oldWidget.oldId,
+		oldWidget.commentDetails,
 		{ mode: 'source' }
 	);
 
@@ -503,8 +509,7 @@ CommentController.prototype.switchToVisual = function () {
 	}
 	this.replyWidgetPromise = this.createReplyWidget(
 		oldWidget.comment,
-		oldWidget.pageName,
-		oldWidget.oldId,
+		oldWidget.commentDetails,
 		{ mode: 'visual' }
 	);
 
diff --git a/modules/CommentDetails.js b/modules/CommentDetails.js
new file mode 100644
index 000000000..9629c3d69
--- /dev/null
+++ b/modules/CommentDetails.js
@@ -0,0 +1,16 @@
+/**
+ * More information about a comment obtained from various APIs, rather than parsed from the page.
+ *
+ * @class CommentDetails
+ * @constructor
+ * @param {string} pageName Page name the reply is being saved to
+ * @param {number} oldId Revision ID of page at time of editing
+ */
+function CommentDetails( pageName, oldId ) {
+	this.pageName = pageName;
+	this.oldId = oldId;
+}
+
+OO.initClass( CommentDetails );
+
+module.exports = CommentDetails;
diff --git a/modules/controller.js b/modules/controller.js
index 72458508d..d2d545d00 100644
--- a/modules/controller.js
+++ b/modules/controller.js
@@ -2,6 +2,7 @@
 
 /**
  * @external CommentItem
+ * @external CommentDetails
  */
 
 var
@@ -10,6 +11,7 @@ var
 	featuresEnabled = mw.config.get( 'wgDiscussionToolsFeaturesEnabled' ) || {},
 	Parser = require( './Parser.js' ),
 	ThreadItem = require( './ThreadItem.js' ),
+	CommentDetails = require( './CommentDetails.js' ),
 	logger = require( './logger.js' ),
 	utils = require( './utils.js' ),
 	pageDataCache = {};
@@ -130,7 +132,7 @@ function getPageData( pageName, oldId, isNewTopic ) {
  * @param {string} pageName Page title
  * @param {number} oldId Revision ID
  * @param {CommentItem} comment Comment
- * @return {jQuery.Promise} Resolves with the pageName+oldId if the comment appears on the page.
+ * @return {jQuery.Promise} Resolved with a CommentDetails object if the comment appears on the page.
  *  Rejects with error data if the comment is transcluded, or there are lint errors on the page.
  */
 function checkCommentOnPage( pageName, oldId, comment ) {
@@ -206,10 +208,7 @@ function checkCommentOnPage( pageName, oldId, comment ) {
 				} ] } ).promise();
 			}
 
-			return {
-				pageName: pageName,
-				oldId: oldId
-			};
+			return new CommentDetails( pageName, oldId );
 		} );
 }
 
diff --git a/modules/dt.ui.ReplyWidget.js b/modules/dt.ui.ReplyWidget.js
index 1c3821bec..99b1cf247 100644
--- a/modules/dt.ui.ReplyWidget.js
+++ b/modules/dt.ui.ReplyWidget.js
@@ -13,6 +13,7 @@ require( './AbandonTopicDialog.js' );
 /**
  * @external CommentController
  * @external CommentItem
+ * @external CommentDetails
  */
 
 /**
@@ -23,12 +24,11 @@ require( './AbandonTopicDialog.js' );
  * @constructor
  * @param {CommentController} commentController Comment controller
  * @param {CommentItem} comment Comment item
- * @param {string} pageName Page name the reply is being saved to
- * @param {number} oldId Revision ID of page at time of editing
+ * @param {CommentDetails} commentDetails
  * @param {Object} [config] Configuration options
  * @param {Object} [config.input] Configuration options for the comment input widget
  */
-function ReplyWidget( commentController, comment, pageName, oldId, config ) {
+function ReplyWidget( commentController, comment, commentDetails, config ) {
 	var widget = this;
 
 	config = config || {};
@@ -39,9 +39,10 @@ function ReplyWidget( commentController, comment, pageName, oldId, config ) {
 	this.pending = false;
 	this.commentController = commentController;
 	this.comment = comment;
+	this.commentDetails = commentDetails;
 	this.isNewTopic = !!comment.isNewTopic;
-	this.pageName = pageName;
-	this.oldId = oldId;
+	this.pageName = commentDetails.pageName;
+	this.oldId = commentDetails.oldId;
 	var contextNode = utils.closestElement( comment.range.endContainer, [ 'dl', 'ul', 'ol' ] );
 	this.context = contextNode ? contextNode.nodeName.toLowerCase() : 'dl';
 	// TODO: Should storagePrefix include pageName?
diff --git a/modules/dt.ui.ReplyWidgetPlain.js b/modules/dt.ui.ReplyWidgetPlain.js
index 2d6837fce..1d08b19be 100644
--- a/modules/dt.ui.ReplyWidgetPlain.js
+++ b/modules/dt.ui.ReplyWidgetPlain.js
@@ -1,6 +1,7 @@
 /**
  * @external CommentController
  * @external CommentItem
+ * @external CommentDetails
  */
 
 var utils = require( 'ext.discussionTools.init' ).utils;
@@ -13,8 +14,7 @@ var utils = require( 'ext.discussionTools.init' ).utils;
  * @constructor
  * @param {CommentController} commentController
  * @param {CommentItem} comment
- * @param {string} pageName
- * @param {number} oldId
+ * @param {CommentDetails} commentDetails
  * @param {Object} [config]
  */
 function ReplyWidgetPlain() {
diff --git a/modules/dt.ui.ReplyWidgetVisual.js b/modules/dt.ui.ReplyWidgetVisual.js
index b09b33d89..4fd1799cb 100644
--- a/modules/dt.ui.ReplyWidgetVisual.js
+++ b/modules/dt.ui.ReplyWidgetVisual.js
@@ -11,6 +11,7 @@ require( './dt-ve/dt.ce.PingNode.js' );
 /**
  * @external CommentController
  * @external CommentItem
+ * @external CommentDetails
  */
 
 /**
@@ -21,11 +22,10 @@ require( './dt-ve/dt.ce.PingNode.js' );
  * @constructor
  * @param {CommentController} commentController
  * @param {CommentItem} comment
- * @param {string} pageName
- * @param {number} oldId
+ * @param {CommentDetails} commentDetails
  * @param {Object} [config]
  */
-function ReplyWidgetVisual( commentController, comment, pageName, oldId, config ) {
+function ReplyWidgetVisual( commentController, comment, commentDetails, config ) {
 	this.defaultMode = config.mode;
 
 	// Parent constructor