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-rw-r--r--docs/reference/gtk/x11.sgml7
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/reference/gtk/x11.sgml b/docs/reference/gtk/x11.sgml
index 0fede1b7fe..0a8ad33f90 100644
--- a/docs/reference/gtk/x11.sgml
+++ b/docs/reference/gtk/x11.sgml
@@ -31,6 +31,13 @@ see <link linkend="gdk-X-Window-System-Interaction">GDK X Window
System interaction</link> in the GDK manual.
</para>
+<para>
+GTK+ includes an cross-process embedding facility in the form of
+the #GtkSocket and #GtkPlug widgets. These are X11-specific, and
+you have to include the <filename>gtk/gtkx.h</filename> header
+to use them.
+</para>
+
<refsect2 id="x11-cmdline">
<title>X11-specific commandline options</title>