[glib] Point out that g_type_init() is required

[Matthias Clasen <matthiasc src gnome org>]

commit 925b4231dc7af90fa9ec2c442e640ebe20aedb5c
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Aug 25 22:07:59 2010 -0400

    Point out that g_type_init() is required

 docs/reference/gio/overview.xml |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gio/overview.xml b/docs/reference/gio/overview.xml
index 0d5b057..5fdfbf8 100644
--- a/docs/reference/gio/overview.xml
+++ b/docs/reference/gio/overview.xml
@@ -182,6 +182,12 @@
       To do so, use the <filename>gio-unix-2.0.pc</filename> file
       instead of <filename>gio-2.0.pc</filename>
     </para>
+
+    <para>
+      Since GIO is based on GObject, you need to call g_type_init()
+      before you can use any GIO functions. If your application uses
+      GTK+, this is already taken care of by gtk_init().
+    </para>
   </chapter>
 
   <chapter>