diff --git a/Quotient/room.cpp b/Quotient/room.cpp
index d80234476..e2fc795cc 100644
--- a/Quotient/room.cpp
+++ b/Quotient/room.cpp
@@ -2121,27 +2121,28 @@ void Room::discardMessage(const QString& txnId)
     emit pendingEventDiscarded();
 }
 
-QString Room::postMessage(const QString& plainText, MessageEventType type)
+QString Room::postMessage(const QString& plainText, MessageEventType type, std::optional<EventRelation> relatesTo)
 {
-    return post<RoomMessageEvent>(plainText, type)->transactionId();
+    return post<RoomMessageEvent>(plainText, type, nullptr, relatesTo)->transactionId();
 }
 
-QString Room::postPlainText(const QString& plainText)
+QString Room::postPlainText(const QString& plainText, std::optional<EventRelation> relatesTo)
 {
-    return postMessage(plainText, MessageEventType::Text);
+    return postMessage(plainText, MessageEventType::Text, relatesTo);
 }
 
 QString Room::postHtmlMessage(const QString& plainText, const QString& html,
-                              MessageEventType type)
+                              MessageEventType type, std::optional<EventRelation> relatesTo)
 {
     return post<RoomMessageEvent>(plainText, type,
-                                  new EventContent::TextContent(html, u"text/html"_s))
+                                  new EventContent::TextContent(html, u"text/html"_s),
+                                  relatesTo)
         ->transactionId();
 }
 
-QString Room::postHtmlText(const QString& plainText, const QString& html)
+QString Room::postHtmlText(const QString& plainText, const QString& html, std::optional<EventRelation> relatesTo)
 {
-    return postHtmlMessage(plainText, html);
+    return postHtmlMessage(plainText, html, MessageEventType::Text, relatesTo);
 }
 
 QString Room::postReaction(const QString& eventId, const QString& key)
@@ -2198,7 +2199,8 @@ QString Room::Private::doPostFile(RoomEventPtr&& msgEvent, const QUrl& localUrl)
 }
 
 QString Room::postFile(const QString& plainText,
-                       EventContent::TypedBase* content)
+                       EventContent::TypedBase* content,
+                       std::optional<EventRelation> relatesTo)
 {
     Q_ASSERT(content != nullptr && content->fileInfo() != nullptr);
     const auto* const fileInfo = content->fileInfo();
@@ -2210,7 +2212,7 @@ QString Room::postFile(const QString& plainText,
 
     return d->doPostFile(
         makeEvent<RoomMessageEvent>(
-            plainText, RoomMessageEvent::rawMsgTypeForFile(localFile), content),
+            plainText, RoomMessageEvent::rawMsgTypeForFile(localFile), content, relatesTo),
         fileInfo->url());
 }
 
diff --git a/Quotient/room.h b/Quotient/room.h
index 720b8d601..cba40ae9c 100644
--- a/Quotient/room.h
+++ b/Quotient/room.h
@@ -746,15 +746,16 @@ public Q_SLOTS:
     /** Check whether the room should be upgraded */
     void checkVersion();
 
-    QString postMessage(const QString& plainText, MessageEventType type);
-    QString postPlainText(const QString& plainText);
+    QString postMessage(const QString& plainText, MessageEventType type, std::optional<EventRelation> relatesTo = std::nullopt);
+    QString postPlainText(const QString& plainText, std::optional<EventRelation> relatesTo = std::nullopt);
     QString postHtmlMessage(const QString& plainText, const QString& html,
-                            MessageEventType type = MessageEventType::Text);
-    QString postHtmlText(const QString& plainText, const QString& html);
+                            MessageEventType type = MessageEventType::Text,
+                            std::optional<EventRelation> relatesTo = std::nullopt);
+    QString postHtmlText(const QString& plainText, const QString& html, std::optional<EventRelation> relatesTo = std::nullopt);
     /// Send a reaction on a given event with a given key
     QString postReaction(const QString& eventId, const QString& key);
 
-    QString postFile(const QString& plainText, EventContent::TypedBase* content);
+    QString postFile(const QString& plainText, EventContent::TypedBase* content, std::optional<EventRelation> relatesTo = std::nullopt);
 
     /** Post a pre-created room message event
      *
diff --git a/quotest/quotest.cpp b/quotest/quotest.cpp
index cbe71075d..341c5e866 100644
--- a/quotest/quotest.cpp
+++ b/quotest/quotest.cpp
@@ -438,7 +438,7 @@ TEST_IMPL(sendFile)
     const auto tfName = tfi.fileName();
     clog << "Sending file " << tfName.toStdString() << endl;
     const auto txnId = targetRoom->postFile(
-        "Test file"_L1, new EventContent::FileContent(tfi));
+        "Test file"_L1, new EventContent::FileContent(tfi), std::nullopt);
     if (!validatePendingEvent<RoomMessageEvent>(txnId)) {
         clog << "Invalid pending event right after submitting" << endl;
         tf->deleteLater();