[glib] gvariant: Briefly mention limits

[Colin Walters <walters src gnome org>]

commit 15b9f64004e7377dabad7b9a03dae094df51a0e4
Author: Colin Walters <walters verbum org>
Date:   Wed Oct 12 15:22:09 2011 -0400

    gvariant: Briefly mention limits

 glib/gvariant.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/glib/gvariant.c b/glib/gvariant.c
index 2661e0d..85c1dad 100644
--- a/glib/gvariant.c
+++ b/glib/gvariant.c
@@ -80,6 +80,11 @@
  * indicator could be placed at the beginning of a file, network message
  * or network stream).
  *
+ * A #GVariant's size is limited mainly by any lowever level operating
+ * system constraints, such as the number of bits in #gsize.  For
+ * example, it is reasonable to have a 2GB file mapped into memory
+ * with #GMappedFile, and call g_variant_new_from_data() on it.
+ *
  * For convenience to C programmers, #GVariant features powerful
  * varargs-based value construction and destruction.  This feature is
  * designed to be embedded in other libraries.