diff --git a/include/modules/sway/window.hpp b/include/modules/sway/window.hpp
index d80cc25..c99ba7f 100644
--- a/include/modules/sway/window.hpp
+++ b/include/modules/sway/window.hpp
@@ -21,7 +21,7 @@ class Window : public AIconLabel, public sigc::trackable {
  private:
   void onEvent(const struct Ipc::ipc_response&);
   void onCmd(const struct Ipc::ipc_response&);
-  std::tuple<std::size_t, int, std::string, std::string, std::string> getFocusedNode(
+  std::tuple<std::size_t, int, std::string, std::string, std::string, std::string> getFocusedNode(
       const Json::Value& nodes, std::string& output);
   void getTree();
   std::string rewriteTitle(const std::string& title);
@@ -35,6 +35,7 @@ class Window : public AIconLabel, public sigc::trackable {
   std::string app_class_;
   std::string old_app_id_;
   std::size_t app_nb_;
+  std::string shell_;
   unsigned app_icon_size_{24};
   bool update_app_icon_{true};
   std::string app_icon_name_;
diff --git a/man/waybar-sway-window.5.scd b/man/waybar-sway-window.5.scd
index e475cea..6e5ebdb 100644
--- a/man/waybar-sway-window.5.scd
+++ b/man/waybar-sway-window.5.scd
@@ -14,8 +14,8 @@ Addressed by *sway/window*
 
 *format*: ++
 	typeof: string ++
-	default: {} ++
-	The format, how information should be displayed. On {} data gets inserted.
+	default: {title} ++
+	The format, how information should be displayed.
 
 *rotate*: ++
 	typeof: integer ++
@@ -80,6 +80,15 @@ Addressed by *sway/window*
 	default: 24 ++
 	Option to change the size of the application icon.
 
+# FORMAT REPLACEMENTS
+
+*{title}*: The title of the focused window.
+
+*{app_id}*: The app_id of the focused window.
+
+*{shell}*: The shell of the focused window. It's 'xwayland' when the window is
+running through xwayland, otherwise it's 'xdg-shell'.
+
 # REWRITE RULES
 
 *rewrite* is an object where keys are regular expressions and values are
diff --git a/src/modules/sway/window.cpp b/src/modules/sway/window.cpp
index dbff90a..ebbfa4b 100644
--- a/src/modules/sway/window.cpp
+++ b/src/modules/sway/window.cpp
@@ -44,7 +44,7 @@ void Window::onCmd(const struct Ipc::ipc_response& res) {
     std::lock_guard<std::mutex> lock(mutex_);
     auto payload = parser_.parse(res.payload);
     auto output = payload["output"].isString() ? payload["output"].asString() : "";
-    std::tie(app_nb_, windowId_, window_, app_id_, app_class_) =
+    std::tie(app_nb_, windowId_, window_, app_id_, app_class_, shell_) =
         getFocusedNode(payload["nodes"], output);
     updateAppIconName();
     dp.emit();
@@ -175,8 +175,8 @@ auto Window::update() -> void {
     bar_.window.get_style_context()->remove_class("solo");
     bar_.window.get_style_context()->remove_class("empty");
   }
-  label_.set_markup(
-      fmt::format(format_, fmt::arg("title", rewriteTitle(window_)), fmt::arg("app_id", app_id_)));
+  label_.set_markup(fmt::format(format_, fmt::arg("title", rewriteTitle(window_)),
+                                fmt::arg("app_id", app_id_), fmt::arg("shell", shell_)));
   if (tooltipEnabled()) {
     label_.set_tooltip_text(window_);
   }
@@ -206,7 +206,7 @@ int leafNodesInWorkspace(const Json::Value& node) {
   return sum;
 }
 
-std::tuple<std::size_t, int, std::string, std::string, std::string> gfnWithWorkspace(
+std::tuple<std::size_t, int, std::string, std::string, std::string, std::string> gfnWithWorkspace(
     const Json::Value& nodes, std::string& output, const Json::Value& config_, const Bar& bar_,
     Json::Value& parentWorkspace) {
   for (auto const& node : nodes) {
@@ -222,31 +222,34 @@ std::tuple<std::size_t, int, std::string, std::string, std::string> gfnWithWorks
         const auto app_class = node["window_properties"]["class"].isString()
                                    ? node["window_properties"]["class"].asString()
                                    : "";
+
+        const auto shell = node["shell"].isString() ? node["shell"].asString() : "";
+
         int nb = node.size();
         if (parentWorkspace != 0) nb = leafNodesInWorkspace(parentWorkspace);
-        return {nb, node["id"].asInt(), Glib::Markup::escape_text(node["name"].asString()), app_id,
-                app_class};
+        return {nb, node["id"].asInt(), Glib::Markup::escape_text(node["name"].asString()),
+                app_id, app_class, shell};
       }
     }
     // iterate
     if (node["type"] == "workspace") parentWorkspace = node;
-    auto [nb, id, name, app_id, app_class] =
+    auto [nb, id, name, app_id, app_class, shell] =
         gfnWithWorkspace(node["nodes"], output, config_, bar_, parentWorkspace);
     if (id > -1 && !name.empty()) {
-      return {nb, id, name, app_id, app_class};
+      return {nb, id, name, app_id, app_class, shell};
     }
     // Search for floating node
-    std::tie(nb, id, name, app_id, app_class) =
+    std::tie(nb, id, name, app_id, app_class, shell) =
         gfnWithWorkspace(node["floating_nodes"], output, config_, bar_, parentWorkspace);
     if (id > -1 && !name.empty()) {
-      return {nb, id, name, app_id, app_class};
+      return {nb, id, name, app_id, app_class, shell};
     }
   }
-  return {0, -1, "", "", ""};
+  return {0, -1, "", "", "", ""};
 }
 
-std::tuple<std::size_t, int, std::string, std::string, std::string> Window::getFocusedNode(
-    const Json::Value& nodes, std::string& output) {
+std::tuple<std::size_t, int, std::string, std::string, std::string, std::string>
+Window::getFocusedNode(const Json::Value& nodes, std::string& output) {
   Json::Value placeholder = 0;
   return gfnWithWorkspace(nodes, output, config_, bar_, placeholder);
 }