diff --git a/gio/ChangeLog b/gio/ChangeLog
index 2ad074d75..ba3dcf2d9 100644
--- a/gio/ChangeLog
+++ b/gio/ChangeLog
@@ -1,3 +1,7 @@
+2008-09-02  Matthias Clasen  <mclasen@redhat.com>
+
+	* gmount.h: Document guess_content_type sync vfunc.
+
 2008-09-02  Michael Natterer  <mitch@imendio.com>
 
 	* gbufferedoutputstream.h (struct _GBufferedOutputStreamClass):
diff --git a/gio/gmount.h b/gio/gmount.h
index 6f0213d13..969d94e10 100644
--- a/gio/gmount.h
+++ b/gio/gmount.h
@@ -62,6 +62,7 @@ typedef struct _GMountIface    GMountIface;
  *     See g_mount_guess_content_type() for more information on content
  *     type guessing. This operation was added in 2.18.
  * @guess_content_type_finish: Finishes a contenet type guessing operation.
+ * @guess_content_type_sync: Synchronous variant of @guess_content_type.
  * 
  * Interface for implementing operations for mounts.
  **/