diff --git a/xfce4-notifyd/xfce-notify-window.c b/xfce4-notifyd/xfce-notify-window.c
index a1470f9..27ba1cd 100644
--- a/xfce4-notifyd/xfce-notify-window.c
+++ b/xfce4-notifyd/xfce-notify-window.c
@@ -692,9 +692,14 @@ void
 xfce_notify_window_set_summary(XfceNotifyWindow *window,
                                const gchar *summary)
 {
+    const char *format = "<b>%s</b>";
+    char *markup;
+    
     g_return_if_fail(XFCE_IS_NOTIFY_WINDOW(window));
+    
+    markup = g_markup_printf_escaped (format, summary);
 
-    gtk_label_set_text(GTK_LABEL(window->summary), summary);
+    gtk_label_set_markup(GTK_LABEL(window->summary), markup);
     if(summary && *summary) {
         gtk_widget_show(window->summary);
         window->has_summary_text = TRUE;
@@ -705,6 +710,8 @@ xfce_notify_window_set_summary(XfceNotifyWindow *window,
 
     if(gtk_widget_get_realized(GTK_WIDGET(window)))
         gtk_widget_queue_draw(GTK_WIDGET(window));
+        
+    g_free (markup);
 }
 
 void