diff --git a/Obsolete.md b/Obsolete.md
index 27dc6fa..e0277e8 100644
--- a/Obsolete.md
+++ b/Obsolete.md
@@ -1,3 +1,6 @@
+# Starting from v0.3.0
+In this release the `col_number_format` and `col_date_type` options are merge in a single `col_types` option defining the type of each column.
+
 # Starting from v0.2.16
 In this release the legacy cookie based persistence implementation has been removed, as a result the following configuration options will no longer be supported:
 - `remember_grid_values`