diff --git a/doc/en/Gtk/Toolbar.xml b/doc/en/Gtk/Toolbar.xml
index 0b0d9262e..789f438bc 100644
--- a/doc/en/Gtk/Toolbar.xml
+++ b/doc/en/Gtk/Toolbar.xml
@@ -221,7 +221,7 @@
         <Parameter Name="position" Type="System.Int32" />
       </Parameters>
       <Docs>
-        <summary>Inserts a stock item at the specified position of the toolbar. If stock_id is not a known stock item ID, it's inserted verbatim, except that underscores used to mark mnemonics are removed.</summary>
+        <summary>Inserts a stock item at the specified position of the toolbar. If <paramref name="stock_id"/> is not a known stock item ID, it's inserted verbatim, except that underscores used to mark mnemonics are removed.</summary>
         <param name="stock_id"> The id of the stock item you want to insert</param>
         <param name="tooltip_text">The text in the tooltip of the toolbar button</param>
         <param name="tooltip_private_text">The private text of the tooltip</param>