diff --git a/data/granite.appdata.xml.in b/data/granite.appdata.xml.in
index fe758ecfa..a79683d62 100644
--- a/data/granite.appdata.xml.in
+++ b/data/granite.appdata.xml.in
@@ -19,6 +19,7 @@
         <p>New Constants:</p>
         <ul>
           <li>STYLE_CLASS_WARMTH and STYLE_CLASS_TEMPERATURE for scales</li>
+          <li>STYLE_CLASS_DEFAULT_DECORATION for slim headerbars</li>
           <li>TRANSITION_DURATION_OPEN and TRANSITION_DURATION_CLOSE for consistent animations</li>
         </ul>
         <p>Other Changes:</p>
diff --git a/lib/Constants.vala b/lib/Constants.vala
index 9a218420f..d44690001 100644
--- a/lib/Constants.vala
+++ b/lib/Constants.vala
@@ -83,6 +83,10 @@ namespace Granite {
      * Style class for color chooser buttons to be applied to {@link Gtk.CheckButton} or {@link Gtk.RadioButton}
      */
     public const string STYLE_CLASS_COLOR_BUTTON = "color-button";
+    /**
+     * Style class for slim headerbars, like in Terminal
+     */
+    public const string STYLE_CLASS_DEFAULT_DECORATION = "default-decoration";
     /**
      * Style class for large primary text as seen in {@link Granite.Widgets.Welcome}
      */