diff --git a/gio/gfile.c b/gio/gfile.c
index 9fd10ca..0af3e09 100644
--- a/gio/gfile.c
+++ b/gio/gfile.c
@@ -64,6 +64,9 @@
  * file content I/O is implemented as streaming operations (see #GInputStream and 
  * #GOutputStream).
  *
+ * Before any use of #GFile,
+ * g_type_init() must be called explicitly or implicitly.
+ *
  * To construct a #GFile, you can use: 
  * g_file_new_for_path() if you have a path.
  * g_file_new_for_uri() if you have a URI.
