diff --git a/Obsolete.md b/Obsolete.md
index 5c31621..d4aa317 100644
--- a/Obsolete.md
+++ b/Obsolete.md
@@ -1,3 +1,20 @@
+# From v0.5.43 on
+The following properties
+- `inf_div_css_class`
+- `left_div_css_class`
+- `right_div_css_class`
+- `middle_div_css_class`
+are deprecated in favor of:
+```javascript
+toolbar: {
+  container_css_class: 'value',
+  left_cont_css_class: 'value',
+  center_cont_css_class: 'value',
+  right_cont_css_class: 'value',
+  target_id: 'value'
+}
+```
+
 # From v0.5.30 on
 The `external_flt_grid` flag is no longer supported