diff --git a/Obsolete.md b/Obsolete.md
index 1243360..999075f 100644
--- a/Obsolete.md
+++ b/Obsolete.md
@@ -1,3 +1,11 @@
+# From v0.6.11 on
+- `single_flt_css_class` configuration option is deprecated in favor of:
+```javascript
+single_filter: {
+  css_class: 'my-css-class'
+}
+```
+
 # From v0.6.10 on
 - `single_filter` configuration option can accept a boolean or a literal object:
 ```javascript