[glib] Document GIO_USE_FILE_MONITOR

[Matthias Clasen <matthiasc src gnome org>]

commit 844527c037717d6d086eed1cf750732032d7585c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Feb 3 14:08:02 2013 -0500

    Document GIO_USE_FILE_MONITOR

 docs/reference/gio/overview.xml |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gio/overview.xml b/docs/reference/gio/overview.xml
index 109392d..6da4492 100644
--- a/docs/reference/gio/overview.xml
+++ b/docs/reference/gio/overview.xml
@@ -333,6 +333,19 @@ Gvfs is also heavily distributed and relies on a session bus to be present.
     </formalpara>
 
     <formalpara>
+      <title><envar>GIO_USE_FILE_MONITOR</envar></title>
+
+      <para>
+        This variable can be set to the name of a #GFileMonitor
+        implementation to override the default for debugging purposes.
+        The #GFileMonitor implementation for local files that is included
+        in GIO on Linux has the name "inotify", others that are built
+        are built as modules (depending on the platform) are called
+        "fam" and "fen".
+      </para>
+    </formalpara>
+
+    <formalpara>
       <title><envar>GIO_USE_VOLUME_MONITOR</envar></title>
 
       <para>